Question

Name the following:

How many elements are there in the first period in the modern periodic table?

Answer 1

• The modern periodic table is an arrangement of all the elements in accordance with their increasing atomic number and recurring chemical properties.
• It is a tabular display of the chemical elements which consists of horizontal rows called periods and vertical columns are called groups.
• In the first period of the modern periodic table, there are only two elements are there that is hydrogen (H) and Helium (He).