Question

write down 3 examples of elements each having valency 1 and 2​

Answer 1

Explanation:

(i) +1 = Hydrogen, Sodium, Potassium.

+2 = Calcium, Magnesium, Zinc.

+3 = Aluminium, Chromium, Ferric [Fe (III)]

(ii) -1 = Chlorine, Bromine, Iodine.

-2 = Oxide, Sulphide, Sulphate.

-3 = Nitrogen, Nitride Phosphate.

Answer 2

Alkali metals are elements with valency 1. Examples include lithium (Li), sodium (Na), potassium (K), rubidium (Rb) and caesium (Cs). Thus, one atom of sodium will combine with one atom of chlorine to from one molecule of sodium chloride (NaCl).

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