Question

The table of the elements is said to be periodic because___

A) The elements are put in numerical order according to the number of protons.
B) The number of energy levels or electron shells increases according to the period number.
C) The properties of the elements repeat themselves according to a regular repeating pattern.
D) The number of valence electrons is reflected in the family number.

Answer 1

The periodic table is said to be periodic because the properties of the elements repeat themselves according to a regular repeating pattern.

Step-by-step explanation:

The periodic table is said to be periodic because the properties of the elements repeat themselves according to a regular repeating pattern. This means that elements with similar properties are grouped together in the same vertical column, which is called a group or family. The periodic table also arranges the elements in increasing order of their atomic numbers, which is the number of protons in the nucleus of an atom.