Q. 6.61 - An Introduction to General, Organic, and Biological Chemistry

Question

Describe the trend in electronegativity as increases or decreases for each of the following:

(a) from B to F     

(b) from Mg to Ba 

(c) from F to I 

Step-by-Step Solution

Answer

(a) Electronegativity will increase.

(b) Electronegativity will decrease.

(c)  Electronegativity will decrease. 

Part (a) Step 1: Given Information

We have to find out the effect of electronegativity from B to F.

Part (a) Step 2: Explanation

Moving left to right across the period, the electronegativity increases and

 going down the group, the electronegativity decreases.

According to given question,

So, B is in ${13}^{th}$ group and F is in ${17}^{th}$ group. The period is same and this shows that going across the period, electronegativity increases.

Hence, electronegativity will increase.

Part (b) Step 1: Given Information

We have to find out the effect of electronegativity from Mg to Ba.

Part (b) Step 2: Explanation

Moving left to right across the period, the electronegativity increases and

going down the group, the electronegativity decreases.

According to the given question,

Mg is in $3^{rd}$ period and Ba is in $6^{th}$ period. The group is same and this shows that going down the group electronegativity decreases.

Hence, electronegativity will decrease.

Part (c) Step 1: Given Information

We have to find out the effect of electronegativity from F to I.

Part (c) Step 2: Explanation

Moving left to right across the period, the electronegativity increases and

going down the group, the electronegativity decreases.

According to the given question,

F is in $2^{nd}$ period and I is in $5^{th}$ period. The group is same and this shows that going down the group electronegativity decreases.

Hence, electronegativity will decrease.