Group numbers	1 - IA	2 - IIA	13 - IIIA	14 - IVA	15 - VA	16 - VIA	17 - VIIA	18 - 0
2nd period	Li		D			O	J	Ne
3rd period	A	Mg	E	Si		H	M
4th period	R	T	I		Q	u		y

In the above table, H does not represent hydrogen.

Some elements are in their own symbol and position in the periodic table, while others are shown with a letter.

Identify :

(i) The most electronegative element.

(ii) The most reactive element of group I.

(iii) The element from period 3 with least atomic size.

(iv) The noble gas of the fourth period.

(v) How many valence electrons are present in Q.

(vi) Which element from group 2 would have the least ionization energy?

(vii) In the compound between A and H, what type of bond is formed and give it's molecular formula.

(i) J is the most electronegative element.

(ii) R is the most reactive element of group 1.

(iii) M is the element from period 3 with least atomic size.

(iv) y is the noble gas of the fourth period.

(v) 5 valence electrons present in Q.

(vi) T is the element from group 2 which has least ionization energy.

(vii) ionic bond is formed between A and H.

The molecular formula is :

2A + H ⟶ A₂H