Q. Number of elements presents in the fifth period of periodic table is
A) 32
B) 10
C) 18
D) 8
Explanation
(c)
The fifth period from nubidium (37) to xenon (54). The last electron enters in 5s, 4d or 5p-orbitals. Therefore, the fifth period has (2+10+6)18 elements.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.