1 Answers
Option 4 : Hydrogen
- The lowest atomic mass of the elements is hydrogen.
- The Atomic Mass is the sum of the mass of protons and neutrons present in the atom of the element.
- The atomic mass of hydrogen is 1 unit, Helium is 2 units, Lithium is 3 units and that of Nitrogen is 7 units.
- The elements are arranged in the periodic table in the increasing order of their atomic masses.
- Hydrogen is the first element in the Periodic Table.
4 views
Answered