Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one :

(a) forms an anion

(b) forms a cation

(c) has four electrons in its valence shell?

How do atoms attain noble gas configuration ?

Elements are classified as metals, non-metals, metalloids and inert gases. Which among them form electrovalent bonds?

An atom X has three electrons more than the noble gas configuration. What type of ion will it form ? Write the formula of its (i) sulphate (ii) nitrate (iii) phosphate (iv) carbonate (v) hydroxide.