1. The table below gives atomic numbers of elements represented by the letters A, B, C and D.

Element	A	B	C	D
Atomic number	15	16	17	20

Use the information to answer the questions that follow.
(a)Name the type of bonding that exists in the compound formed when A and D react(1 mark)
(b)Select the letter which represents the best oxidizing agent. Give a reason for your answer.

2. The table below gives information about elements A₁, A₂, A₃ and A₄

Element	Atomic Number	Atomic Radius (nm)	Ionic radius (nm)
A1	3	0.134	0.074
A2	5	0.090	0.012
A3	13	0.143	0.050
A4	17	0.099	0.181

(i)In which period of the periodic table is element A2? Give a reason.(2 marks)
(ii)Explain why the atomic radius of:
I.A1 is greater than that of A2;
II.A4 is smaller than its ionic radius(2 marks)
(iii)Select the element which is in the same group as A3(1 mark)
(iv)Using dots (.) and crosses(x) to represent outermost electrons, draw a diagram to show the bonding in the compound formed when A1 reacts with A4(1 mark)

3. The atomic number of sulphur is 16. Write the electron arrangement of sulphur in the following(2 marks)
(a)H2S
(b)SO32-