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The position of three elements A, B and C in the periodic table are shown below :

Groups→
Periods↓		 1 2 3
I A
II B
III C
IV
V
VI
VII
VIII

Give reasons to explain the following :

(i) Element 'A' is a metal.

(ii) Element 'B' has larger size than 'C'.

(iii) Element 'C' has a valency - 3.

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1 Answers

(i) Element 'A' is a metal because it is present in group I (1 valence electron) and can lose an electron easily.

(ii) Element B has a larger size than 'C' because. it has more number of shells than 'C'.

Also, B lies in the third period and has three shells whereas B lies in the second period and has two shells.

(iii) 'C' being an element of 3rd group has three valence electrons, therefore its valency is 3.

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