Manipur Board Solutions for Chapter: Periodic Classification of Elements, Exercise 8: EXERCISES

The position of three elements A, B and C in the periodic table are shown below.

Will C be larger or smaller in size than B?

The position of three elements A, B and C in the periodic table are shown below.

What type of ion (cation or anion ) will be formed by A?

Element $\mathrm{X}$ forms a chloride with the formula ${\mathrm{XCl}}_2$. With which of the following elements, $\mathrm{X}$ would most likely be in the same group of the periodic table? $\mathrm{Na}, \mathrm{Mg}, \mathrm{Al}, \mathrm{C}$.

Name two elements you would expect to show chemical properties similar to $\mathrm{Li}$. What is the basis of your choice?

What properties do all elements in the same group of boron in the periodic table have in common?

An atom has electronic configuration $2, 8, 6$. 
(a) What is the atomic number of this element ? 
(b) Which of the following elements would it be similar in chemical properties? 
$\mathrm{N}\left(7\right), \mathrm{F}\left(9\right), \mathrm{P}\left(15\right), 0\left(8\right), \mathrm{Ar}\left(18\right)$

“Note: This question given in the book seems to have error and the modified question should be as given below.”

An atom has electronic configuration $2, 8, 7$. 
(a) What is the atomic number of this element ? 
(b) Which of the following elements would it be similar in chemical properties? 
$\mathrm{N}\left(7\right), \mathrm{F}\left(9\right), \mathrm{P}\left(15\right), 0\left(8\right), \mathrm{Ar}\left(18\right)$

Nitrogen (atomic no. $7$) and Phosphorous (atomic no. $15$) belong to group $15$ of the periodic table. Which of them will be more electronegative and why?

In the modern Periodic table, calcium (at. no. $20$) is surrounded by elements with atomic numbers $12, 19, 21$ and $38$. Which of them have physical and chemical properties resembling calcium?