Name or state the following with reference to the elements of the first three periods of the periodic table.

(a) Noble gas with duplet arrangement of electrons.

(b) Metalloid in Period 3.

(c) Valency of elements in Group 14 and 15.

(d) Noble gas having electronic configuration 2, 8, 8.

(e) Group whose elements have zero valency.

(f) A covalent compound formed by an element in period 2 and a halogen.

(g) Non-metallic element present in Period 3 of Groups 15 and 16.

(h) An electrovalent compound formed by an alkaline earth metal and a halogen.

(i) Bridge elements of Period 3 of Group 1, 2 and 3.

(j) Alkali metal in Period 3 that dissolves in water giving a strong alkali.

(k) Typical elements of Groups 14 and 15.

(l) Alkaline earth metal in Period 3.

(a) Helium (He)

(b) Silicon (Si)

(c) 4, 3

(d) Argon (Ar)

(e) Group 18 — Noble gases

(f) Carbon tetrachloride (CCl₄)

(g) Phosphorus and sulphur

(h) Magnesium chloride (MgCl)

(i) Lithium (Li) and Magnesium (Mg);
    Beryllium (Be) and Aluminium (Al);
    Boron (B) and Silicon (Si)

(j) Sodium (Na)

(k) Silicon (Si) and phosphorus (P).

(l) Magnesium (Mg)