1. 1

2. Vocabulary
ATOM-the smallest unit that maintains the characteristics of an element
Nucleus- The center of the atom, contains protons and neutrons
Electron Cloud –Region surrounding the nucleus containing the electrons 2

3. The Atom 3

4. Nucleus
Protons
Neutrons 4

5. The Atom 5

6. Atomic Math
Atomic Number – the number of protons in the nucleus of an atom
Mass Number/Atomic Mass – the number of protons and neutrons in the atom

7. Isotope – Atoms with the same number of protons and different numbers of neutrons

8. The Nucleus
The number of protons is the same as the atomic number Li 3 7
The Atomic Symbol
The atomic mass
The atomic mass 8

9. Li 3 7 The Nucleus Neutrons = atomic mass – atomic number
The atomic number
The atomic mass
The atomic mass 9

10. Li 3 7 7 (Atomic Mass) -3 protons(Atomic #) 4 neutrons
The atomic number
The atomic mass
The atomic mass 10

11. Review
How many protons does Mg have?
How many neutrons does Mg Have?

12. How many protons does Mg have?12
How many neutrons does Mg Have? 12

13. The Electron Cloud
Electrons - The number of electrons equals the number of protons 13

14. Review
How many protons?
How many neutrons?
How many electrons?

15. How many protons? 3
How many neutrons? 4
How many electrons? 3