P : 2, 8, 1; | Q : 2, 5 |
R : 2, 8, 7; | S : 2, 8, 5 |
I. period of the periodic table. |
II. P is an alkali metal. |
III. R is a metal. |
IV. Valency of element S is 3. |
A) I and II only
B) II and IV only
C) I and III only
D) All of these
Correct Answer: B
Solution :
P (2, 8, 1) : group 1, alkali metal Q (2, 5) : period 2, Group 15, valency 3. R (2, 8, 7) : period 3, group 17, valency 1, non-metal S (2, 8, 5) : period 3, group 15, valency 3 non-metalYou need to login to perform this action.
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