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Multi-Electron Configurations and Orbital Diagrams

An elements h...

Question

An elements has electronic configuration $2, 8, 18, 1$ . If its atomic weight is $63$ , then how many neutrons will be present in its nucleus?

A

30

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B

32

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C

34

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D

33

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Solution

The correct option is C $34$
The element is $C u_{29}^{63}$ .

Number of neutrons $=$ atomic mass $-$ atomic number

$= 63 - 29 = 34$ .

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