Question

Give the number of elements in 1st and 3rd period in Modem Periodic table?​

Answer 1

Answer:

First period contains 2 elements and is called very short period. Second and third periods contain 8 elements each and are called as short periods. Thank you!

Answer 2

First period contains 2 elements and is called very short period. Second and third periods contain 8 elements each and are called as short periods.

Hope this helps