Fill in the blanks:

(a) Dalton used symbol …………… for oxygen and …………… for hydrogen.

(b) Symbol represents …………… atom of an element.

(c) Symbolic expression for a molecule is called …………… .

(d) Sodium chloride has two radicals. Sodium is a …………… radical while chloride is a …………… radical.

(e) Valency of phosphorus in PCl₃ is …………… and in PCl₅ is …………… .

(f) Valency of Iron in FeCl₂ is …………… and in FeCl₃ it is …………… .

(g) Formula of iron (III) carbonate is …………… .

(a) Dalton used symbol $\bigcirc$ for oxygen and $\odot$ for hydrogen.

(b) Symbol represents one atom of an element.

(c) Symbolic expression for a molecule is called molecular formula .

(d) Sodium chloride has two radicals. Sodium is a basic radical while chloride is a acidic radical.

(e) Valency of phosphorus in PCl₃ is 3 and in PCl₅ is 5 .

(f) Valency of Iron in FeCl₂ is 2 and in FeCl₃ it is 3 .

(g) Formula of iron (III) carbonate is Fe₂(CO₃)₃ .