Question

should explain.
how did it get the +2oxidation state.
how did you find which metal belong to 17th group.
how did you find the period.....
plz sent me your answers .
I will mark you the BRAINLIST...​

Answer 1

Answer:a) B

b) C

c) 3rd period. Because it has 3 shells with principal quantum number 1 ,2 ,3.

d) D it has one outer electron and is thus a metal and can form cation by losing single valence electron.It reacts with oxygen to form metallic oxide which have basic character.

Explanation: