Question

7. Amongst the elements given in the list below, pick out the elements which are :
(i) most electropositive (ii) most electronegative (iii) noble gases.
Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, CI, Ar, K, Ca.
::)​

Answer 1

Answer:

Most electropositive elements are $Li, Na,$ and $K$.

Most electronegative elements are $F, O, N,$ and $Cl$.

Noble gases are $Ne$ and $Ar$

Explanation:

(i) Electropositivity is the character of losing valence electrons easily. Alkali earth metals are the most electropositive elements.

Hence, most electropositive elements are $Li, Na,$ and $K$.

(ii) Electronegativity is the character of attraction of electrons towards themselves. Halogens are the most electronegative elements in the periodic table. This character increases along the period and decreases down the group.

Hence, most electronegative elements are $F, O, N,$ and $Cl$.

(iii) Noble gases are also known as inert gases. The elements which have completely filled electrons in their outer shells are known as noble gases.

Hence, noble gases are $Ne$ and $Ar$.