Atom+Notes

[|Atom Song]

(Right side, Cornell Style Notes / Left side, draw pictures that captures the concept of each note) __ Atom Facts __ a. Atomic number = how many protons b. Atomic number determines the kind of atom c. Atomic mass = Protons + Neutrons (Average) d. Atomic mass – Protons = Neutrons e. Atomic mass – Neutrons = Protons f. Isotopes – Element with different numbers of neutrons

Atom Notes 1 1. Protons, neutrons, and electrons are the three subatomic particles that make up atoms. 2. Protons and neutrons are found in the nucleus of an atom. 3. Electrons are found in a cloud around the nucleus. (Thousands of times bigger than the nucleus) 4. The number of protons in an atom's nucleus determines the kind of atom. 5. Nuclei are tiny, but contain almost all the mass of an atom. 6. Protons and Neutrons have a mass of 1amu. 7. 1,836 electrons equal the mass of one proton or neutron.

Atom Notes 2 8. Charges of the atomic particles: Protons (+), neutrons (0), electrons (-) 9. Usually atoms have a neutral charge, because each proton will attract an electron to the atom. 10. The atomic number of an atom is the number of protons in its nucleus. 11. Atomic mass is the average mass of an element’s atoms. (Isotopes included) 12. Atomic mass = mass of protons + mass of neutrons. 13. Atomic mass - Atomic number = Number of neutrons 14. Atoms of the same kind with different numbers of neutrons are called isotopes.

Isotopes of Carbon