Chapter 5, Problem 1KT

Interpretation Introduction

Interpretation:

The key term corresponding to the definition “the properties of elements recur in a repeating pattern when arranged by increasing atomic number” is to be stated.

Concept introduction:

The elements in a modern periodic table are arranged in an increasing order of their atomic number. In the modern periodic table, the horizontal rows are known as periods, whereas vertical columns are known as groups. There are $7$ periods and $18$ groups in a modern periodic table.