Question

find the atomic number of the element whose electronic configuration is 2,8,5 and 2,8,8

Answer 1

Answer:

1 - 15

2- 18

Explanation:

the atomic number = the no. of electrons

so 2,8,5 = 15 so its atomic no. is 15

and 2,8,8 = 18 so its atomic no. is 18