Electron Configuration

Question 1

Core Notation

Answer 1

Electrons can be divided into core electrons (completely filled. Have configuration of nearest noble gas with fewer electrons) and outer electrons (all electrons outside the core). 
ex. Cl: [Ne] 3s2 3p5 (2 + 5 = 7)
      17  10
           \+7
           2p6

Question 2

Electron Configuration

Answer 2

Full electron configuration.

ex. Na 1s2 2s2 2p6 3s1 (2+2+6+1=11)

Question 3

Electron Configuration Exceptions

Answer 3

Filled or half filled d-subshells are stable
ex. Cr: [Ar] 4s2 3d4
[Ar] 4s1 3d5

Question 4

Electron Configuration of Ions

Answer 4

Fluorine has 9 protons so it would go to Helium which has 2. If F becomes charged, F-, it would then have 10 protons.
ex.
F: [He] 1s2 2s2 3p5
F -1: [He] 1s2 2s2 3p6

Question 5

Anions

Answer 5

Negatively charged ions

Question 6

Cations

Answer 6

Positively charged ions (cats have pos)

Question 7

Steps

Answer 7

1. Write electron configuration for atom
2. Remove electrons from outermost shell first
3. P(t)SD (Owen has PTSD but Teddy left so its just PSD lol)
   ex. Sn2+
   Sn: [Kr] 5s2 4d10 5p2
   Sn2+ [Kr] 5s2 4d10
   Sn4+ [Kr] 4d10