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Question

Alkali metals in each period have:

A
Smallest size
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B
Lowest IE
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C
Highest IE
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D
Highest eletronegativity
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Solution

The correct option is B Lowest IE
As we move along the period, the size of an atom decreases from left to right along a period. Alkali metals are placed at extreme left, they have larger size.

Alkali metals have low effective nuclear charge. So, the outermost electron can easily be escaped to attain noble gas configuration. Thats why they have lowest IE their respective period.

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