Question

can anyone ans my question please ​

Answer 1

1) Ca = 2,8,8,2

2) Rb = 2,8,18,8,1

3) Sr = 2,8,18,8,2 so 5 shells

4) K = 2,8,8,1 i.e it is a metal as it is electropositive in nature

5) Sr will have the largest atom