Classification Of Elements And Periodicity In Properties Ques 130
Question: An element with atomic number 20 will be placed in which period of the periodic table [MNR 1986; UPSEAT 1999]
Options:
A) 4
B) 3
C) 2
D) 1
Show Answer
Answer:
Correct Answer: A
Solution:
$ ,1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2} $ principal quantum no. is 4 so it belongs to 4th period.
