Question

Elements P, Q, R, S have atomic numbers 5, 3, 19, 16 respectively. Which of these

elements –


a) fall in the same group?

b) fall in the same period?

c) have similar chemical properties?

d) is a non-metal?

e) is a semi-metal?

f) is an alkali?

g) belongs to the family of chalcogens?

h) has a greater size between P and Q?

i) is more metallic between R and S?

j) has a valency of 3?​

Answer 1

Answer:

(a)Q & R

(b)P & Q

(c)Q & R (because these two happen to be in the same group)

(d)P & S

(e)none

Explanation:

Hope this'll help.

Answer 2

Answer:

a.3 and 19 I,e.Q and R

b.3 and 5i,eQ and P

c.3 and 19i,eQ and R

d.16i,eS

e.5i,eP

f.3 and 19 are alkali.i,eQ and R

g.16 I,eS

h.p has greater size

i.R is more metallic.

j.p i,e 5.

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