Question

11. W, X, Y , Z have atomic numbers 4, 7, 11 & 12. The elements belonging to same group are
A)W & X
B) X & Y
C) W & Z
D) Y & Z​

Answer 1

A force is the change of state of an object due to external surroundings. Due to forces, an object will either be in a state of motion or will be resting. For example, consider a football placed on the ground motionless. To move the ball in any direction, you will have to apply some forces on the ball.

Answer 2

Explanation:

(i) w is the noble gas having atomic number 10 and configuration (2,8)

(ii) x, y and z are the s block elements. They have 2,2 and 1 electrons in their outermost shell respectively.

(iii) Atomic size decreases across the period and increases down the group. Element z is having more atomic size.