Question

Give a one-word answer.

The longest period of the periodic table.

Answer 1

Modern periodic table:

• The modern periodic table is an arrangement of all the elements known in accordance with their increasing atomic number and recurring chemical properties.
• It is a tabular display of 118 chemical elements which consists of horizontal rows called periods and vertical columns are called groups.
• All elements in a group have the same number of valance electrons, and in period elements have the same number of electron shells.
• There are seven periods and eighteen groups in the modern periodic table.

Longest period:

• The sixth period is called the longest period because it has a maximum of 32 elements.
• It starts with cesium (atomic number 55) and ends with radon (atomic number 86).