Q. 6.64 - An Introduction to General, Organic, and Biological Chemistry

Question

Using the periodic table, arrange the atoms in each of the following sets in order of increasing electronegativity: 

(a) CI, F, Br 

(b) B, O, N 

(c) Mg, F, S

Step-by-Step Solution

Answer

(a) The correct order is Br, Cl, F.

(b) The correct order is B, N, O.

(c) The correct order is Mg, S, F.

Part (a) Step 1: Given Information

We have to find out the effect of electronegativity on Cl, F, Br.

Part (a) Step 2: Explanation

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

going down the group, the electronegativity decreases 

According to the given question,

Cl, F, and Br are in ${17}^{th}$ group and $3^{rd},2^{nd} and 4^{th}$period, respectively, which shows that the correct order of electronegativity will be Br, Cl, F.

Hence, this is the correct order.

Part (b) Step 1: Given Information

We have to find out the effect of electronegativity on B, O, N.

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,

B, O, and N are in $2^{nd}$ period and ${13}^{th},{16}^{th}and {15}^{th}$group respectively, which shows that the correct order of electronegativity will be B, N, and O.

Hence, this is the correct order.

Part (c) Step 1: Given Information

We have to find out the effect of electronegativity on Mg, F, S.

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,

Mg, and S are in $3^{rd}$ period and $2^{nd} and {16}^{th}$group respectively, while F is in $2^{nd}$ period and group, which shows that the correct order of electronegativity will be Mg, S, and F.

Hence, this is the correct order.