Atomic Structure Question 68
Question: An atom has the electronic configuration of $ 1s^{2},2s^{2}2p^{6} $ , $ 3s^{2}3p^{6}3d^{10},4s^{2}4p^{5} $ . Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be
Options:
A) 35 and 45
B) 45 and 35
C) 40 and 40
D) 30 and 50
Show Answer
Answer:
Correct Answer: A
Solution:
$ _{35}Br^{80},=1s^{2},2s^{2},2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{5} $
$ A=,80 $ , $ Z=,35 $ , $ N=,- $
$ N=A-Z=80-35=45 $ atomic number (Proton) is 35 and no. of neutron is 45.
