1. Basic atomic Structure and Mass 2.2

2. Atomic Particles Particle Charge Mass # Location Electron -1
Electron cloud
Proton +1 1
Nucleus
Neutron

3. Atom with the Electron Cloud Electrons are not in set Orbitals.

4. Nuclear Forces

5. Atomic Radii

6. Charles-Augusten de Coulomb 1785

7. Coulombs forces The closer the electron; the stronger the force

8. Atomic Number
Atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element.
Element
# of protons
Atomic # (Z)
Carbon 6
Phosphorus 15
Gold 79

9. Mass Number Mass # = p+ + n0
Mass number is the number of protons and neutrons in the nucleus of an isotope.
Mass # = p+ + n0
Nuclide p+ n0 e-
Mass #
Oxygen - 10 - 33 42
- 31 15 18 8 8 18
Arsenic 75 33 75
Phosphorus 16 15 31

10. Dmitri Mendeleev 1869

11. Dmitri’s Periodic Table

12. Modern Periodic Table

13. Atomic Number for an Selenium Top = superscript

14. Atomic Number

15. Atomic Mass for an Selenium Bottom = subscript

16. Atomic Mass

17. Isotope and Hyphen notation

18. Isotope and Nuclear notation

19. Calculating Average Atomic Mass