Question

Electrons revolve around the nucleus in definite orbits called _________.

Answer 1

• Electron- An electron is a negatively charged subatomic particle revolving around the nucleus of an atom in definite orbits called energy shells.
• It was discovered by J.J.Thomson.
• The electronic configuration of an element describes how electrons are distributed in different orbits.
• Electrons in an atom revolve in fixed orbits known as energy shells.
• The electrons are filled in the increasing number of shells viz. K,L,M,N,etc.
• Let us take the example of aluminum. The atomic number of aluminum is $13$.
• So, the electronic configuration of aluminum will be $2,8,3$.

Hence, Electrons revolve around the nucleus in definite orbits called energy shells or energy levels.