Question

(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).
(b) An element Y has a valency of 4. Write the formula for its (i) chloride
(ii) oxide
(iii) sulphate
(iv) carbonate
(v) nitrate

Answer 1

Answer:

(a)Ions: E.g.Ca²+ (Calcium),

Na+ (Sodium)

Polyatomic ions: E.g.NH⁴+(Ammonium)

H₃O+(Hydronium)

(b)(i)YCl₄ (Chloride)

(ii)YO₂ (Oxide)

(iii)Y(SO₄)₂ (Sulphate)

(iv)Y(NO₃)₄ (Nitrate)

i hope it helps you ^_^

Answer 2

Explanation:

(i) chloride -$Y C l_{4}$

(ii) oxide - $Y O_{2}$

(iii) sulphate - $Y\left(S O_{4}\right)_{2}$

(iv) carbonate - $Y\left(C O_{3}\right)_{2}$

(v) nitrate - $Y\left(N O_{3}\right)_{4}$

Compounds are formed by crossing the valencies are shown in the below figure.