Question

Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table:

Group→   Period↓	1	2	3-12	13	14	15	16	17	18
2	A					B			C
3				D	E				F

On the basis of the above table, answer the following questions:-

(i) Name the element which forms only covalent compounds.

(ii) Name the element which is a metal with valency three.

(iii) Name the element which is a non-metal with valency three.

(iv) Out of D and E, which is bigger in size and why?

(v) Write the common name for the family to which the elements C and F belong.

Answer 1

Group→   Period↓	1	2	3-12	13	14	15	16	17	18
2	A (Li)					B (N)			C (Ne)
3				D (Al)	E (Si)				F (Ar)

 

(i) Element E - Silicon forms only covalent compounds.

(ii) Aluminium (Element D) is a metal with the valency 3.

(iii) Nitrogen (Element B) is a non-metal with the valency 3.

(iv) Out of D (Aluminium) and E (Silicon), aluminium has a larger size than silicon. This is because atomic size decreases across the period.

(v) Common name for the family to which the elements C (Neon) and F (Argon) belong is 'Noble gas' or 'Inert gas'.