Class 9 Science Notes Chapter 4 Structure of The Atom

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Chapter :Structure of the atom

Chapter 4
Structure of the atom
Multiple Choice Questions
1. Which of the following correctly represent the electronic distribution in the Mg atom?
(a) 3, 8, 1
(b) 2, 8, 2
(c) 1, 8, 3
(d) 8, 2,
2 Soln:
Answer is 2, 8,
2 Explanation :
Atomic number of Mg is 12 hence electronic distribution will be 1s22s22p63s2.
2. Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in to discovery of
(a) Electron
(b) Proton
(c) Nucleus in the atom
(d) Atomic mass
Soln:
Answer is (c) Nucleus in the
atom Explanation:
Rutherford’s ‘alpha (α) particles scattering experiment’ experiment concludes that alpha particles returned to their
original path. This showed the presence of nucleus in the centre.
3. The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following
is the correct representation of the element?
(a) 31 15 X
(b) 31 16 X
(c) 16 15 X
(d) 15 16 X
Soln:
Answer is (a) 31 15
X Explanation:
Number of protons in an element depicts atomic number. Number of protons and electrons are equal in an
element. Hence atomic number is written in subscript whereas mass number is written in the subscript before the
symbol of the element.

4. Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion
(a) (i), (ii) and (iii)
(b) (i), (iii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (ii) and (iv)
Soln:
Answer is (d) (i), (ii) and (iv)
Explanation:
Dalton’s theory explains Law of conservation of mass, Law of constant composition, Law of multiple proportion.
But it never give any details of Law of radioactivity .
5. Which of the following statements about Rutherford’s model of atom are correct?
(i) considered the nucleus as positively charged
(ii) established that the α–particles are four times as heavy as a hydrogen atom
(iii) can be compared to solar system
(iv) was in agreement with Thomson’s model
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) only (i)
Soln:
Answer is (a) (i) and (iii)
Explanation:
Positively charged alpha particles were deflected by nucleus. This shows nucleus is positively charged.
Rutherford also postulated that electrons are arranged in an atom around the nucleus like planets arranged around
sun.
6. Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
Solution:
Answer is (d) (ii) and (iv)

Explanation:
Atomic number Z is the number of proton present in an electron which is also equal to number pf electron in an
atom. Since the mass of neutron is negligible. Number of protons and electron are added to obtain mass number of
an element.
7. In the Thomson’s model of atom, which of the following statments are correct?
(i) the mass of the atom is assumed to be uniformaly distributed over the atom
(ii) the positive charge is assumed to be uniformaly distributed over the atom
(iii) the electrons are uniformaly distributed in the positively charged sphere
(iv) the electrons attract each other to stabilise the atom
(b) (i) and (iii)
(c) (i) and (iv)
(d) (i), (iii) and (iv)
Soln:
Answer is(a) (i), (ii) and (iii)
Explanation:
Thomson proposed that negatively charged electron are stabilised by positively charged protons in the nucleus.
Hence option II) the positive charge is assumed to be uniformly distributed over the atom is wrong statement and
other statements are part of Thomson’s model of atom.
8. Rutherford’s α–particle scattering experiment showed that
(i) electrons have negative charge
(ii) the mass and positive charge of the atom is concentrated in the nucleus
(iii) neutron exists in the nucleus
(iv) most of the space in atom is empty Which of the above statements are correct?
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv
Soln:
Answer is (b) (ii) and (iv)
Explanation:
An atom consists of a positively charged, dense and very small nucleus which have all the protons and neutrons.
Positive charge is due to protons, as neutrons have no charge. Here the space is empty because alpha particles
pass straight through the gold foil without any deflection.
Thomson explained that electron s have negative charge. Existence of neutron was discovered by Chadwick.

9. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons
is 14. What is the number of electrons in the ion?
(a) 13
(b) 10
(c) 14
(d) 16
Soln:
Answer is (b) 10
Explanation:
Mass number (A) of the atom = 27
Number of neutron in the atom =14
Number of Electrons=Mass number-Number of neutrons=27-14
Number of electrons= 13
Since ions of the element has 3 positive charges number of electron in the ion is 13-3 which equal 10.
Hence the answer is 10
10. Identify the Mg2+ ion from the Fig.4.1 where, n and p represent the number of neutrons and protons
respectively.
Soln:
Answer is d)
Explanation:
Number of protons in Mg atom = 2+ 8 + 2 = 12
Number of neutrons in Mg atom = 24 -12 = 12
[as mass number of Mg atom = 24 and number of neutrons = mass number – number of protons]
Therefore, option (d) is the correct answer

11. In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of
electrons but different number of neutrons. Which of the following is the correct reason for it?
(a) One of the oxygen atoms has gained electrons
(b) One of the oxygen atoms has gained two neutrons
(c) The two oxygen atoms are isotopes
(d) The two oxygen atoms are isobars.
Soln:
Answer is(c) The two oxygen atoms are isotopes
Explanation:
Two Oxygen atoms in CH3COOC2H5 can have different number of neutrons only if the two O-atoms are isotopes.
Isotopes of an element have same number of protons (and electrons) but different number of neutrons.
12. Elements with valency 1 are
(a) always metals
(b) always metalloids
(c) either metals or non-metals
(d) always non-metals
Soln:
Answer is (c) either metals or non-metals.
Explanation:
If element shows positive valency it is a metal and if the element shows negative valency it will be a non-metal.
13. The first model of an atom was given by
(a) N. Bohr
(b) E. Goldstein
(c) Rutherford
(d) J.J. Thomson
Soln:
Answer is (d) J.J. Thomson
14. An atom with 3 protons and 4 neutrons will have a valency of
(a) 3
(b) 7
(c) 1
(d) 4
Soln:
Answer is (c) 1
15. The electron distribution in an aluminium atom is
(a) 2, 8, 3
(b) 2, 8, 2
(c) 8, 2, 3
(d) 2, 3, 8

Soln:
Answer is (a) 2, 8, 3
Explanation:
Atomic number of Aluminium is 13, First shell can have maximum of 2 electron and second shell holds a
mximum of 8 electrons. Hence option a is right answer.
16. Which of the following in Fig. 4.2 do not represent Bohr’s model of an atom correctly?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)
Soln:
Answer is ii and iv
Explanation :
First shell can have maximum of 2 electron and second shell can have maximum of 8 electron hence ii and iv do
not represent Bohr’s model of an atom correctly.
17. Which of the following statement is always correct?
(a) An atom has equal number of electrons and protons.
(b) An atom has equal number of electrons and neutrons.
(c) An atom has equal number of protons and neutrons.
(d) An atom has equal number of electrons, protons and neutrons.
Soln:
Answer is (a) An atom has equal number of electrons and protons.
Eplanation:
An atom is electrically neutral because the number of protons are always equal to number of electrons. Hence
option a) is right.
18. Atomic models have been improved over the years. Arrange the following atomic models in the order of
their chronological order
(i) Rutherford’s atomic model
(ii) Thomson’s atomic model
(iii) Bohr’s atomic model

(b) (ii), (iii) and (i)
(c) (ii), (i) and (iii)
(d) (iii), (ii) and (i)
Soln:
Answer is (c) (ii), (i) and (iii)
Explanation:
Thomson’s atomic model was proposed in the year 1904
Rutherford’s atomic model was proposed in the year 1911
Bohr’s atomic model was proposed in the year 1913
Short Answer Questions
19. Is it possible for the atom of an element to have one electron, one proton and no neutron. If so, name the
element.
Soln:
Yes, Hydrogen is the element which is having only 1 proton and 1 electron and no neutron hence there is no
repulsive force in the nucleus hence it is stable.
20. Write any two observations which support the fact that atoms are divisible
 Ionic compounds are formed because of formation of ions that involves transfer of electrons.
 Difference in the number of make isotopes. This shows that atom is formed by different particles such as
electrons, protons and neutrons and element is divisible.
21. Will 35Cl and 37Cl have different valencies? Justify your answer.
Soln:
35Cl and 37Cl cannot have different valencies because they are the isotopes of same element.
22. Why did Rutherford select a gold foil in his α–ray scattering experiment?
Soln:
Rutherford used gold for his scattering experiment because gold is the most malleable metal and he wanted the
thinnest layer as possible.
Therefore, Rutherford selected a Gold foil in his alpha scatttering experiment.

23. Find out the valency of the atoms represented by the Fig. 4.3 (a) and (b).
Soln:
Atom (a) has zero valency as it has 8 electron in its valence shell making the configuration stable.
Atom (b) has valency of +1 as it has 7 electrons in it outermost shell . It can accept 1 electron to achieve octet
configuration.
24. One electron is present in the outer most shell of the atom of an element X. What would be the nature
and value of charge on the ion formed if this electron is removed from the outer most shell?
Soln:
If an electron is removed from the outermost shell a cation will be formed and the charge of the element will be
+1.
25. Write down the electron distribution of chlorine atom. How many electrons are there in the L shell?
(Atomic number of chlorine is 17).
Soln:
Atomic number of chlorine atom = 17
So, its electronic configuration is
K L M
2 8 7
L shell of chlorine contains 8 electrons.
26. In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas
configuration by accepting requisite number of electrons, then what would be the charge on the ion so
formed?
Soln:
In this atom 6 electrons are already present in its outermost orbitals. In order to attain noble gas configuration
element has to accept two electron hence its charge is -2.

27. What information do you get from the Fig. 4.4 about the atomic number, mass number and valency of
atoms X, Y and Z? Give your answer in a tabular form.
Soln
Atomic number, mass number and valency of atoms X, Y and Z
Atomic no Mass no Valency
X 5 11 3
Y 8 18 2
Z 15 31 3.5
28. In response to a question, a student stated that in an atom, the number of protons is greater than the
number of neutrons, which in turn is greater than the number of electrons. Do you agree with the
statement? Justify your answer.
Soln
Statement is wrong because number of protons can never be greater than number of neutrons. Number of protons
will always be less than or equal to number of neutrons. Number of electrons and protonsare always equal in a
neutral atom.
29. Calculate the number of neutrons present in the nucleus of an element X which is represented as 𝒙
𝟏𝟓
𝟑𝟏
Soln:
Mass number = No. of protons + No. of neutrons = 31
∴ Number of neutrons = 31– number of protons
= 31–15
= 16

30. Match the names of the Scientists given in column A with their contributions towards the
understanding of the atomic structure as given in column B
(A) (B)
(a) Ernest Rutherford (i) Indivisibility of atoms
(b) J.J.Thomson (ii) Stationary orbits
(c) Dalton (iii) Concept of nucleus
(d) Neils Bohr (iv) Discovery of electrons
(e) James Chadwick (v) Atomic number
(f) E. Goldstein (vi) Neutron
(g) Mosley (vii) Canal rays
Soln:
(A) (B)
(a) Ernest Rutherford (iii) Concept of nucleus
(b) J.J.Thomson (iv) Discovery of electrons
(c) Dalton (i) Indivisibility of atoms
(d) Neils Bohr (ii) Stationary orbits
(e) James Chadwick (vi) Neutron
(f) E. Goldstein (vii) Canal rays
(g) Mosley (v) Atomic number
31. The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these
elements is 40. What is the name given to such a pair of elements?
Soln:
Elements with different atomic numbers but same mass numbers are known as isobars. Calcium and argon are
isobars.
32. Complete the Table 4.1 on the basis of information available in the symbols given below
(a) 35 17 Cl (b) 12 6 C (c) 81 35 Br
Element np nn
Soln:
Element np nn
Cl 17 18
C 6 6
Br 35 46

33. Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain
Soln:
Helium has 2 electrons in its outermost shell thereby completing duplet configuration. Hence it has no valence
shell left empty making its valency 0.
34. Fill in the blanks in the following statements
(a) Rutherford’s α-particle scattering experiment led to the discovery of the ———
(b) Isotopes have same ———but different———.
(c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be———and——
—respectively.
(d) The electronic configuration of silicon is ———and that of sulphur is ———
Soln:
(a) Rutherford’s α-particle scattering experiment led to the discovery of the atomic nucleus
(b) Isotopes have same atomic number but different mass number
(c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be 0 and 1
respectively.
(d) The electronic configuration of silicon is 2.8.4 and that of sulphur is 2.8.6
35. An element X has a mass number 4 and atomic number 2. Write the valency of this element?
Soln:
Mass number = 4
Atomic number = 2
X is Helium.
It has 0 valency and it will not react with any other atom because it has its outer shell filled.
Long Answer Questions
36. Why do Helium, Neon and Argon have a zero valency?
Soln:
Helium has 2 electron in its outermost orbit thus filling shell 1 and forming duplet configuration in valence shell
.Neon has 8 electron in their valence orbit hence completing duplet configuration. In the same way Argon and
Neon has 8 electron in its outermost shelling completing octet configuration. As these elements have maximum
electron in their valence shell thus reach stable electron configuration and they will not take part in any sort of
chemical reactions.

37. The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to
be spherical,
(i) What will be the ratio of their sizes?
(ii) If atom is represented by planet earth ‘Re ’ = 6.4 ×106 m, estimate the size of the nucleus.
Soln:
38. Enlist the conclusions drawn by Rutherford from his α-ray scattering experiment.
Soln:
Rutherford drawn following conclusion from his α-ray scattering experiment.
 α-particles passed through the gold foil without any deflection concluding the empty space inside the
atom.
 Deflection is observed in few particles which proves positive charge of the atom occupies very little
space.
 Deflection in A very small fraction of α-particles indicates that all the positive charge and mass of the
gold atom were concentrated in a very small volume within the atom.

39. In what way is the Rutherford’s atomic model different from that of Thomson’s atomic model?
Soln:
Rutherford proposed that electron revolve around the nucleus in well differentiated orbits. Nucleus is the centre
which is positively charged. Rutherford proposed that nucleus is very small and nearly all the mass of an atom is
centred in the nucleus.
.
Thompson proposed that electron are scattered positively charged spheres like a Christmas pudding and the mass
of the atom was supposed to be uniformly distributed.
40. What were the drawbacks of Rutherford’s model of an atom?
Soln:
Rutherford’s model could not explain the stability of the atom.
Revolving electrons would lose energy as they are the charged particles and due to acceleration, charged particles
would radiate energy.
Orbit of the revolving electron will reduce in size, following a spiral path as shown in figure and ultimately the
electron should fall into the nucleus. In other words, the atom should collapse.
41. What are the postulates of Bohr’s model of an atom?
Soln:
Postulates of Bohr’s model of an atom are
(i) Only certain special orbits known as discrete orbits of electrons, are allowed inside the atom.
(ii) While revolving in discrete orbits the electrons do not radiate energy. These orbits or shells
are called energy levels. These orbits or shells are represented by the letters K,L,M,N,… or
the numbers, n=1,2,3,4,….

42. Show diagramatically the electron distributions in a sodium atom and a sodium ion and also
give their atomic number.
Soln:
Atomic number of sodium (Z) =11 Mass number of sodium (A) = 23
Number of protons in the nucleus = 11 Number of neutrons in the nucleus =23-11 = 12
Number of electrons = 11
Electronic configuration of Na-atom = 2, 8, 1(K,L,M)
Na+ ion is formed from s,odium atom by loss of an electron (present in the outermost shell). Hence, its
electronic configuration is 2, 8(K,L). However, number of protons and neutrons remains the same.
43. In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an
atom, ~ 1.00% of the α-particles were found to deflect at angles > 50º. If one mole of α-particles were
bombarded on the gold foil, compute the number of α-particles that would deflect at angles less than 500.
Soln:
Total number of α particles used for bombardment = 1 mole
1 mole=6.022x1023
particles
number of α particles deflected at angles greater than 50°(>50°)= 1%
Number of α particles deflected at angles greater than 50° =100-1= 99%
Actual number of α particles deflected at angles less than 50°=
99
100
× 6.022 × 1023
=5.96× 1023

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