Question

the atomic number of an element is 20. in Modern Periodic Table this element is placed in which period​

Answer 1

Answer:

Calcium atomic no. 20

3rd periof

2nd group

Answer 2

Given

Atomic number = 20

Electronic configuration = 2,8,8,2

So the element present in group 2 and period 4 since the number of cell is 4 k, l, m and n