Saleha Pervez and Shikha Goel Solutions for Chapter: Periodic Properties and Their Variations, Exercise 6: ARCHIVES* (Last 6 Years)

Arrange the following as per the instruction given in the bracket.

$\mathrm{H}\mathrm{e}, \mathrm{A}\mathrm{r}, \mathrm{N}\mathrm{e}$ (Increasing order of the number of electron shells).

Arrange the following as per the instruction given in the bracket.
$\mathrm{N}\mathrm{a}, \mathrm{L}\mathrm{i}, \mathrm{K}$(Increasing ionisation energy).

Arrange the following as per the instruction given in the bracket.
$\mathrm{F}, \mathrm{C}\mathrm{l}, \mathrm{B}\mathrm{r}$ (Increasing electronegativity).

Arrange the following as per the instruction given in the bracket.
$\mathrm{N}\mathrm{a}, \mathrm{K}, \mathrm{L}\mathrm{i}$ (Increasing atomic size).

Match the atomic number $2,4,8,15$ and $19$ with each of the following:

(i) A solid non-metal belonging to the third period.

(ii) A metal of valency $1$.

(iii) A gaseous element with valency $2$.

(iv) An element belonging to group $2$.

(v) A rare gas.

Identify the term/substance in the following
The tendency of an atom to attract electrons towards itself when combined in a compound.

Rewrite the following sentence by using the correct symbol $>$ (greater than) or $<$ (less than) in the blank given.

The ionisation potential of potassium is less than _____ that of sodium.

Use the letters only written in the periodic table given below to answer the questions that follow

(i) State the number of valence electrons in atom $\mathrm{J}$.

(ii) Which element forms ions with a single negative charge?

(iii) Out of $\mathrm{I}$ and $\mathrm{R}$ which one is more reactive?

(iv) Which element has its electrons arranged in four shells?