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Q.

Which of the following elements contains 2 shells and both are completely filled?


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a

Neon

b

Helium

c

Boron

d

Calcium 

answer is A.

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Detailed Solution

Neon contains 2 shells and both are completely filled.
In general, neon has two shells, both of which are completely filled with electrons (2 electrons in K-shell and 8 electrons in L-shell). It is non-reactive, while its shells are full. Since neon has two atomic shells, it needs two electrons in the first shell, and eight to fill the second shell. As a result, neon has a total of ten electrons which means two filled shells.
 
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