Question

When an electron from shell 'M' jumps to ‘K' shell then energy is………………

Answer 1

This question is based on Bohr’s atomic model and energy of shells. Try to remember the relation between shell number and energy. When an electron jumps from lower to higher shell it absorbs energy. When an electron jumps from higher to lower shell, then it releases energy.

Complete step by step answer:
According to Bohr’s atomic model as we move to higher shells the energy increases. Now we know that ‘K’ shell is the first shell the order of shells is as follows :
K , L , M , N ….
So the K shell is the first shell and the M shell is the third shell . So if an electron jumps from the first shell to the third shell the energy of the electron will increase .

Additional information:
Bohr’s model of atom :
To overcome the drawback of Rutherford’s model of atom and to explain the line spectrum of hydrogen, Neils Bohr, a Danish physicist in 1913 proposed a new model of atom based upon Planck’s quantum theory. This new model is called Bohr’s model .
Postulates of Bohr’s Model of Atom
The main postulates of Bohr’s model of atom are as follows :
1. An atom consists of a small , heavy positively charged nucleus in the centre and the electrons revolve around it in circular orbits .
2. Out of a large number of circular orbits theoretically possible around the nucleus, the electrons revolve only in those orbits which have a fixed value of energy . Hence, these orbits are called energy levels or stationary states .

Note: Students remember when we calculate the total energy of electrons in a shell, the energy is negative . So as we move to a higher shell the energy becomes less negative means the energy increases. They must know about energy release or absorb if an electron moves from higher to lower or lower to higher shell.