Q. 6.111

Consider an ion with the symbol $X^{2 +}$ formed from a representative

element.

a. What is the group number of the element?

b. What is the Lewis symbol of the element?

c. If $X$ is in Period $3$ , what is the element?

d. What is the formula of the compound formed from $X$ and

the nitride ion?

Verified

Answer

a. Group number of the element will be $2$ .

b. Lewis symbol is given below.

c. The element will be magnesium.

d. The formula of the compound formed from $X$ and the nitride ion is $X_{3_{}} N_{2}$ .

1Part(a) Step 1: Given information

We need to find the group number of respective element.

2Part(a) Step 2: Explanation

As the element is having $2$ electrons in outermost shell so the group number for the element will be $2$ .

3Part(b) Step 1: Given information

We need to find the Lewis symbol for the given element.

4Part(b) Step 2: Explanation

As it has two electrons in outermost shell so the Lewis symbol will be

5Part(c) Step 1: Given information

We need to find the element with period number $3$ and group number $2$ .

6Part(c) Step 2: Explanation

The element with group number $2$ and period $3$ is magnesium with symbol $M g^{2 +}$ .

7Part(d) Step 1: Given information

We need to find the formula of the compound formed between $X$ and nitride.

8Part(d) Step 2: Explanation

Oxidation state of $X$ is $+ 2$

Oxidation state of nitride is $- 3$

So the formula of compound will be $X_{3} N_{2}$ .