Question

Read the following and answer any four questions from 20(i) to 20(v). (1x4=4)

The table given below shows the mass number and number of neutrons in four elements P,

Q, R and S.

Element P Q R S

Mass number 12 20 23 35

Number of nutrons 6 10 12 18

(i) Which of the following element has atomic number 17?

(a) P (b) Q (c) R (d) S

(ii) P and Q belong to

(a) Group-14 (b) Group-14 and Group-18

(c) Group-1 and Group-17 (d) Group-18 and Group-1

(iii) R and S belong to

(a) Period-2 (b) Period-3 (c) Period-4 (d) Period-5

(iv) Which of the following is a noble gas?

(a) P (b) Q (c) R (d) None of these

(v) Which of the following is an alkali metal?

(a) P (b) Q (c) R (d) S​

Answer 1

I thought (a) ☺️ thanks