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Atomic Number and Mass Number

An element ha...

Question

An element has three electrons in the 4th shell, the atomic number of the element is:

A

13

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B

21

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C

27

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D

31

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Solution

The correct option is C 31
The configuration is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{1}$ .

Three electrons in the 4th shell is the element Gallium (Ga), atomic number 31.

Hence, option D is correct.

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