Question

Fill in the blanks with suitable words.

There are______elements in the longest period of modern 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.
• The sixth period contains 32 elements that are from Cesium (atomic number 55) to Radon (atomic number 86) and is also known as the longest period.
• The seventh period also contains 32 elements that are from Francium (atomic number 87) to Oganesson (atomic number 118) and is also the longest period.

Therefore, There are 32 elements in the longest period of the modern periodic table.