Question

the atomic number of 3 elemets A,B, and C is 13,15 and 17. Which of them will form an anion with valency 1 ?

Answer 1

Answer:

C

Explanation:

electronic configuration of C=2,8,7 so it needs one electron to become stable by octet rule

Answer 2

Answer:

13 Aluminum valancy 3

15 Phosphorus valancy 3

17 chloride valancy 1