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Question

Which of the following is an alkaline earth metal?

A
11Na
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B
12Mg
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C
19K
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D
13Al
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Solution

The correct option is B 12Mg

Alkaline earth elements are elements found in the second group of the periodic table. These elements have two valence electrons.
In the given options magnesium (Mg) is the only element having two valence electrons. So it belongs to the second group and is an alkaline earth metal.


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