Question

What is bohrs and bury rule

Answer 1

1-Maximum number of electrons that can be accommodated in a shell is given by 2n2 where n = shell numberFor 1st energy level, n = 1Maximum number of electrons in 1st energy level = 2n22 x (1) 2 = 2For 2nd energy level n = 2Maximum number of electrons in the 2nd energy level = 2n22 x 22 = 2 x 4 = 8For 3rd energy level n = 3Maximum number of electrons in the 3rd energy level = 2n2= 2x(3) 2= 2 x 9 = 18For 4th energy level n = 4Maximum number of electrons in the 4th energy level = 2n2= 2x(4) 2= 2x16 = 32

2-The outermost shell of an atom cannot accommodate more than 8 electrons, even if it has a capacity to accommodate more electrons. This is a very important rule and is also called the Octet rule. The presence of 8 electrons in the outermost shell makes the atom very stable.

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Tripathy

Answer 2

Hellooo!!

Mr. Bury and Mr Niels Bohr formulated that electrons move around the nucleus  in a orbit in which they do not radiate their energy. This orbit is also known as an energy shell.The no.of electrons a shell can hold is fixed.The formulae for calculating maximum capacity  of a shell is 2n2 where n is the no.of energy shell.

Thus 1st shell can hold 2, 2nd 8, 3rd 18 and so on and so forth. But at most times it is observed that the electrons like to stable octate form of noble elements so the energy shell usually holds 2,8,8 respectively in 1st,2st and 3rd shells.

hope it helps