Problem 43

Given information

The given groups of atoms are as follows: 

Step-by-step explanation

The metallic character of metal is defined as the level of reactivity of that metal. It decreases from left to right across a period in the periodic table and increases down the group in the periodic table.

In the given group of atoms, down the group comes first, and hence, it has more metallic character than, and .

In the given group of atoms, across the period comes first, and hence, it has more metallic character than .