Q. 175.0( 2 Votes )

An element placed

Answer :

(i) Since the element is placed in 2nd group and 3rd period of the periodic table then this means the element has 2 valence electrons and 3 shells. So it is Magnesium (Mg).

(ii) Its electronic configuration is 2, 8, 2.

(iii) The chemical equation when it burns in the presence of air is

2Mg + O2 2MgO

(iv) The balanced equation when this oxide is dissolved in water is

MgO + H2O Mg(OH)2


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