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Question

An element X belongs to 3rd period and group 2 of the periodic table. State :

(a) number of valence electrons (b) valency (c) metal or non-metal (d) name of the element

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Solution

(a) The element X has 2 valence electrons because it belongs to group 2.

(b) Since the number of valence electrons and the valency of group 2 elements is 2, the valency of element X is 2.

(c) Group 2 is on the left side of the periodic table which consists of metals. Therefore X is a metal.

(d) The name of the element is Magnesium (Mg) since X belongs to group 2 and the 3rd period.


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