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Q.

An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table. The number of valence electrons in Y is


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a

3

b

4

c

5

d

6 

answer is C.

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Detailed Solution

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An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table. The number of valence electrons in Y is 5.
The electrons are which present in the outermost shell of an atom of an element are known as valence electrons. They determine the valency of an element. All the elements of the same group of the modern periodic table have the same number of valence electrons. All the elements of group 15 have 5 valence electrons each in their atoms. Y belongs to group 15, so the number of valence electrons in Y is 5.
 
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