electronic configuration of species M-1 is 1s2 2s2 2p6 and its atomic weigth is 56. The number of neutrons in the nucleus of species M is
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^_^ 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
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