Question

Name the elements of the shortest period in the modern periodic table.

Answer 1

Part 1: Modern periodic table:

• The modern periodic table is an arrangement of the elements in accordance with their increasing atomic number.
• It is a tabular display of 118 chemical elements which consists of horizontal rows called periods and vertical columns are called groups.

Part 2: Elements of the shortest period in the modern periodic table:

• The shortest period in the modern periodic table is the first period.
• This period contains only two elements i.e. hydrogen ($\mathrm{H}$) and helium ($\mathrm{He}$).

Hence, the elements of the shortest period in the modern periodic table are hydrogen and helium.