Subatomic Particles
- 1. Subatomic Particles Names, Properties, and Locations Atomic mass and isotopic mass Ions by Lisa Allen
- 2. Protons Positive charge Found in the nucleus Mass of 1 AMU (atomic mass unit) The number of protons in an atom is equal to the atomic number of that element. This is always true. So an atom of oxygen always has 8 protons, no matter what else about that atom is different. An atom with 11 protons is always sodium. ALWAYS.
- 3. How many protons are there in...? Uranium-238? Carbon? Zinc? Gold? Potassium ions? Chlorine gas atoms? Lithium found in pills? Carbon found in CO 2 ?
- 4. Neutrons No charge Found in the nucleus Mass of 1 AMU (atomic mass unit) The number of neutrons in an atom is equal to the atomic mass minus the atomic number of that element.
- 5. How many neutrons are there in...? Carbon atoms? Sodium atoms? Silver atoms?
- 6. Average atomic mass and Isotopes Question to show the point – How many kids are there in your family? Average number may not be the number in any particular family! Isotopes are atoms with a specific number of neutrons. They have the same number of protons, the same charge, but have a specific atomic mass. Isotopes can be identified with 2 different notations Hyphen notation: Carbon - 14 Nuclear symbol notation: 14 6 C (hard to type!) To find the number of neutrons in an isotope, subtract the number of protons (atomic number) from the atomic mass.
- 7. Finding the mass of an isotope Add the number of protons and the number of neutrons Practice? What is the mass of the isotope of carbon with 8 neutrons? What is the mass of the isotope of aluminum with 14 neutrons?
- 8. Electrons Negative Charge Found in energy levels outside the nucleus Mass of 1/1836 AMU (almost nothing!) The number of electrons in a neutral atom is equal to the number of protons. The number of electrons in an ion is different from the number of protons .
- 9. How many electrons are there in...? Carbon? Sodium +1 ion? Uranium – 238? Cl - ion? O 2- Magnesium? Cobalt?
- 10. Practice these! http://chemistry2.csudh.edu/homework/hwintro.html Go to 11 Get 10 right out of 12 or fewer attempts Submit to LAllen Print confirmation for your records Submit confirmation