Q. 4.66 - An Introduction to General, Organic, and Biological Chemistry

Question

Fill in the following blanks using larger or smaller, higher or lower. Mg has a ______ atomic size and a ______ ionization energy than Cs.

Step-by-Step Solution

Answer

Mg has smaller atomic size and a higher ionization energy than Cs.

Step 1: Given Information

We have to find out whether Mg has larger atomic size or smaller atomic size than Cs and also if it has high ionization energy or less ionization energy than Cs.

Step 2: Explanation

Moving left to right in a period, atomic size decreases due to an increase in effective nuclear charge and ionization energy increases.

Mg is in $2^{nd}$ group and $3^{rd}$ period while Cs is in $1^{st}$ group and $6^{th}$ period.

This shows that Mg has a smaller atomic size than Cs and a higher ionization energy than Cs.