Atomic Structure Question 91

Question: The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is [CPMT 1997; Pb. PMT 1999; MP PMT 1999]

Options:

A) 17

B) 37

C) 2

D) 38

Show Answer

Answer:

Correct Answer: D

Solution:

No. of proton and no. of electron = 18 $ [Ar_18^{36}] $ and No. of neutron = 20 Mass number = P + N = $ 18+20=38. $



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