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Question

Which of the following element has a total of two shells, with three electrons in its valence shell?


A
Lithium
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B
Boron
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C
Phosphorus
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D
Oxygen
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Solution

The correct option is B Boron

From the given information,
electronic configuration of the element is 2,3. So, the atomic number is five.

Therefore, boron is the element which has a total of two shells, with three electrons in its valence shell and with atomic number five.

Whereas, lithium has total 2 shells, with one electron in its valence shell.

Phosphorus has total 3 shells, with five electrons in its valence shell.

Oxygen has total 2 shells, with six electrons in its valence shell.


Chemistry

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