Question

The atomic number of elements of 5th period lies in the range of
a)38 to 47
b)39 to 48
c) 37 to 54
d)41 to 50

Answer 1

Answer:

c) 37 to 54 is right answer..

Answer 2

Answer:

c)37 to 54

Explanation:

1st period contains 2 element

2nd and 3rd periods contain 8 elements respectively

and 4 th period contains 18 elements.

so 2+8+8+18=36..next ,5th period start 37 to 54 bcz it's also contains 18 element