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Q.

Which of the following is the correct order of increasing atomic size?


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a

P < Si < Al < Na

b

Si < Al < P < Na

c

Al < Na < P < Si

d

Na < P < Si < Al 

answer is A.

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Detailed Solution

P < Si < Al < Na is the correct order of increasing atomic size.
The atomic size of a chemical element is a measure of the size of its atoms, usually the distance from the centre of the nucleus of the atom up to the boundary of the surrounding shells of electrons. In general atomic radius decreases across the period and increases down a group.
 
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