write any 3 laws mentioned by bohr bury
Answers
Electrons revolve around the nucleus in different energy levels or shells and each shell is associated with definite energy. The energy of the K shell is the least while those of L, M, N and O shells increases progressively. We also know that any system that has least energy is the most stable.
1st energy level is K shell2nd energy level is L shell
3rd energy level is M shell4th energy level is N shell and so on.
There are some examples where this rule fails... there the Afbau Principle comes:
Sometimes the electronic configuration is also described by box notation form i.e., putting an arrow for single electron in a box or a pair of arrows for two electrons in a box. The direction of the arrows gives the orientation of its spin.Further the box is labelled on top by writing the symbol of the orbital.
Rules-for-Filling-the-Orbitals">
Rules for Filling the Orbitals
The principle states that the electron in an atom are so arranged that they occupy orbitals in the order of their increasing energy. Since the energy of a 'n' orbital in the absence of any magnetic field depends on the 'n' and 'l' quantum number values, the order of filling orbitals with electrons may be obtained from the (n + l) rule of Bohr Bury's rule.According to this principle the orbital with the lowest energy will be filled first. The orbital having lower (n + l) value has lower energy. However for orbitals whose (n + l) values are equal, the orbital having lower value of 'n' has lower energy. It is important to remember that because of this rule, this sequence of energy levels pertains to energy level up to '3p' and thereafter, '4s' orbitals comes first instead of '3d'. Thus, the orbitals should be filled in the order:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s
Is Bohr-Bury rule applicable to all atoms?
Electrons revolve around the nucleus in different energy levels or shells and each shell is associated with definite energy. The energy of the K shell is the least while those of L, M, N and O shells increases progressively. We also know that any system that has least energy is the most stable.
1st energy level is K shell2nd energy level is L shell
3rd energy level is M shell4th energy level is N shell and so on.
There are some examples where this rule fails... there the Afbau Principle comes:
Sometimes the electronic configuration is also described by box notation form i.e., putting an arrow for single electron in a box or a pair of arrows for two electrons in a box. The direction of the arrows gives the orientation of its spin.Further the box is labelled on top by writing the symbol of the orbital.
Rules-for-Filling-the-Orbitals">
Rules for Filling the Orbitals
The principle states that the electron in an atom are so arranged that they occupy orbitals in the order of their increasing energy. Since the energy of a 'n' orbital in the absence of any magnetic field depends on the 'n' and 'l' quantum number values, the order of filling orbitals with electrons may be obtained from the (n + l) rule of Bohr Bury's rule.According to this principle the orbital with the lowest energy will be filled first. The orbital having lower (n + l) value has lower energy. However for orbitals whose (n + l) values are equal, the orbital having lower value of 'n' has lower energy. It is important to remember that because of this rule, this sequence of energy levels pertains to energy level up to '3p' and thereafter, '4s' orbitals comes first instead of '3d'. Thus, the orbitals should be filled in the order:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s