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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 1s22s22p63s23p63d104s24p1.

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

Hence, option D is correct.

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