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Question

The atomic size of lithium is _____ than that of sodium.


A

greater

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B

smaller

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Solution

Step-1:

Atomic radii is the distance of the electrons in the outermost from the atomic nucleus. It increases from top to bottom in a group and decreases from left to right in a period but is highest for a noble gas.

Step-2:

The Sodium (Na) and Lithium (Li) belongs to group 1. The atomic radius of Lithium is smaller than Sodium. Sodium, the outermost shell is M-shell (n=3) but in Lithium the outermost shell is L-shell (n=2). Thus , the increase in number of shells increase the size of the atom in a group.

Final answer:

The atomic size of Lithium is smaller than that of Sodium.


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