Draw the electron dot structure for the following.

(a) NH₄⁺

(b) CaO

Distinguish between the following as directed.

(a) Sodium carbonate and sodium sulphate using H₂SO₄.

(b) Lead (II) oxide and zinc oxide using H₂SO₄.

An element 'Y' is in II period and group 16 of the periodic table.

Answer the following questions:

(a) Is it a metal or a non-metal?

(b) Write the valence electrons present in the element Y.

(c) What is its valency?

Define:

(a) Alkanes

(b) Alkenes