Question

39. An element with atomic number 40 is placed in period. (A) 5 (B) 6 (C)4 (D) 3

plz give an explanation​

Answer 1

Answer:

Hence, the element with the atomic number 40 belongs to the d-block in the fifth period with group number 4. Note: Do not get confused with the penultimate shell to be considered. Here, the penultimate shell to be taken is 4d not 3d to find out the group number.

Explanation:

I hope it helps you

please mark me brainlist