Chapter U1.18, Problem 1TAI

Interpretation Introduction

Interpretation:

The reason for the elements in the same group in the periodic havingsimilar properties needs to be explained.

Concept introduction:

Vertical columns are known as groups in the periodic table. There are 18 groups in the long form of periodic table.

Answer to Problem 1TAI

As chemical properties are controlled by valence electrons thus elements belonging to same group of periodic table have similar properties.

Explanation of Solution

Valence shell electrons participate in chemical reactions and core electrons remain unreacted. Elements belonging to same group have same number of valence shell electrons which means the outer electronic configuration is identical. Thus, properties of such elements are similar. For example, properties of group 17 elements like F, Cl, Br and I are similar as all of them have 7 electrons in the valence shell.

Conclusion

Due to similar outer electronic configuration, elements belonging to same groups have similar properties.