Question

State Bohr-Bury formula for determining the number of electrons in a given shell.

Answer 1

Bohr-Bury rule states

• The electrons are arranged around the nucleus in different energy levels or energy shells.
• The electrons first occupy the shell with the lowest energy, i.e, closer to the nucleus.
• The first or innermost shell (K or n=1) can take 2 electrons.
• The second (L or n=2) can contain up to 8 electrons.
• From the third shell (M or n=3) shells become bigger. The third shell can accommodate up to 18 electrons.
• General formula of the maximum number of electrons in any shell=2n²