Question

i) Which atom is biggest in size ?

a) W

b) U

c) Y

d) Z

ii) Which two elements are placed in group 14 of the periodic table ?

a) T,Y

b) U,Y

c) T,X

d) U,X

iii) Identify the most electropositive atom ?
a) Z

b) Y

c) R

d) U

iv) Which of these atoms have valency as one ?

a) U,V,W,Y

b) Y,Z,U,R

c) R,Y,V,U

d) Z,X,Y,R

v) Identify the inert or noble atom ?

a) T

b) U

c) V

d) W ​

Answer 1

Answer:

1 francium

2 Carbon group element, any of the six chemical elements that make up Group 14 (IVa) of the periodic table—namely, carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (Fl).

3 Electropositive: An element with low electronegativity. ... Cesium and francium (shown in blue) are the least electronegative (most electropositive) elements (EN = 0.7).

4 For example, all the metals, be it hydrogen, lithium, sodium and so on, present in column 1 have valency +1. Similarly, all the elements present in column 17 have valency -1 such as fluorine, chlorine, and so on. All the noble gases are arranged in column 18

5Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).