Question

The diagrams given below show the electron arrangement in the outer shells of five elements 1 to 5 All elements are from period 3 of the periodic table Which two elements will form a compound with the $Y{Z}_2$ type formula ?

• A. 4 and 2
• B. 5 and 2
• C. 3 and 5
• D. Both A and B

Answer 1

Answer: (A)

4 and 2

$Y{Z}_2$ $\to Y^{+2}+Z^{-}$
So Y have 2 valence electron while Z have 7 valence electron.
so here, these two elements are 4 and 2.