1. Atomic notation X A Z X = Symbol (C, Au) A = Atomic Mass Number = #nucleons (Protons + Neutrons) Z = Atomic Number = #protons C 12 6 Carbon A = 12, Z = 6. #neutrons?

2. Isotopes Carbon 12 has 6 Neutrons C 12 6 C 14 6 Carbon 14 has 8 Neutrons Carbon 14 is an isotope of Carbon Chemically the same Nuclear-lly different (it’s unstable) C-14, C-12 Show chart of the nuclides…

4. Hydrogen has a Z = 1, A = 1 p + 2 n = 3 What is the Atomic notation for tritium? (tritium is an isotope of Hydrogen with 2 neutrons) 3/1 H

5. 22/10 Ne Z = 10, A = 10 + 12 = 22, element 10 is Ne 10 protons, 12 neutrons. What is its atomic notation?

6. 143 U is element 92 235 - 92 = 143 neutrons How many neutrons in U 235? (235 = A) (1)

7. 126 Pb is element 82 208 - 82 = 126 neutrons How many neutrons in Pb 208? (208 = A) (1)

8. 42 Kr is element 36 78 - 36 = 42 neutrons How many neutrons in Kr 78? (1)