Question

Write the rules suggested by Bohr and Bury for the distribution of electrons in an atom.

Answer 1

Bohr and Bury suggested the distribution of electrons into different orbits of an atom.

The rules which are followed while writing the number of electrons in different energy shells or levels are as follows:

• The maximum number of electrons present in a shell is 2n², where n is the orbit number or energy level, 1, 2, 3, 4, etc.

For example:

• First orbit or K-shell contains = 2(1)² = 2 electrons
• Second orbit or L- shell contains = 2(2)² = 2(4) = 8 electrons.
• Third orbit or M- shell contains = 2(3)² = 2(9) = 18 electrons.
• Fourth orbit or N- shell contains = 2(4)² = 2(16) = 32 electrons and so on.
• The maximum number of electrons that can be accommodated in the outermost orbit or shell is 8.
• Unless the inner shells are filled the electrons are not accommodated in a given shell (i.e., the shells are filled in a stepwise manner) and in the order of their increasing energy.