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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An element ‘X’ belongs to 3rd period and group 16 of the Modern Periodic Table.

a) Determine the number of valence electrons and the valency of ‘X’.

b) Molecular formula of the compound when ‘X’ reacts with hydrogen and write its electron dot structure.

c) Name the element ‘X’ and state whether its a metal or a non- metal.

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