State the oxidation state of the metal and the total valence electron count of the following species.

1. TiF₆²⁻

+4 and 12

2. Ni(en)₃²⁺ 

+2 and 20

3. Cu(NH₃)₆²⁺

+2 and 21

4. W(CN)₈⁴⁻ 

+4 and 18

5. CH₃Co(CO)₄

0 and 18