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Ionic Compounds: Chemical Formula

An element X ...

Question

An element X is in group 13 of the periodic table.
(a) What will be the formula of its chloride?
(b) What will be the formula of its oxide?

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Solution

Valence shell of element X contains three electrons.

(a) The formula of chloride of element X will be XCl₃.

(b) The formula of an oxide of element X will be X₂O₃.

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Element A is in the $1^{s t}$ group of the Modern Periodic Table. The formula of its ion will be :

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