Question

Electronic configuration of species M²⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ and its atomic weight is 56. The number of neutrons in the nucleus of species M is
a) 26
b) 22
c) 30
d) 24

Answer 1

^_^ Atomic Structure ^.^
Final Answer : 30

Seems like there is Conceptual error :
Correction : Replace Atomic Weight with Mass Number. ^_^

Steps:
1) No. of electrons in M(2+) = 2+2+6+2+6+6 = 24
No. of electrons in M = 24 + 2 = 26
Since, M is neutral ,
=> No. of protons =No. of electrons
=> No. of protons = 26

2)Mass Number = No. of protons + No. of Neutrons
=> 56 = 26 + n
=> n = 30

Therefore, No of Neutrons = 30 .

Answer 2

Answer:

30

Explanation:

ok it is final answers ok ma