Question

Q9. What are ions? Name the elements with variable valency​

Answer 1

ION - AN ATOM OR MOLECULE WITH A NET ELECTRIC CHARGE DUE TO THE LOSS OR GAIN OF ONE OR MORE ELECTRONS.

ELEMENTS WITH VARIABLE VALENCY- COPPER, TIN, IRON AND MERCURY.

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Answer 2

Valency is the combining capacity of an element. The number of electrons donated or accepted by an atom of an element so as to have electronic configuration of nearest noble gas is called its valency

Examples of variable valency

copper, tin, iron and mercury exhibit variable valency.