describe Bohr's model of the atom
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Niels Bohr proposed the Bohr Model of the Atom in 1915. ... The Bohr Model is a planetary model in which the negatively-charged electrons orbit a small, positively-charged nucleus similar to the planets orbiting the Sun (except that the orbits are not planar).
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Bohr’s Model Of An Atom
1)An atom is made up of three particles:electrons,protons and neutrons.Electrons have negative charge,protons have positive charge whereas neutrons have no charge.Due the presence of equal number of negative electrons and positive protons,the atom on the whole is electrically neutral.
2)The protons and neutrons are located in a small nucleus at the centre of an atom.Due to the presence of protons,nucleus is positively charged.
3)The electrons revolve around the nucleus in fixed circular paths called energy levels or shells.The energy levels or shells are represented in two ways:
a)K,L,M,N…….
b)1,2,3,4,5……
4)The first energy level or k shell can hold maximum of 2 electrons.
The second energy level or L shell can hold maximum of 8 electrons.
The third energy level or M shell can hold maximum of 18 electrons.
The fourth energy level or N shell can hold maximum of 32 electrons.
5)Each energy level or shell is associated with fixed amount of energy.There is no change in energy as long as they keep revolving in same energy level.
6)The change in energy of an electron take place when it
a)Jumps from lower energy level to higher energy level(gain energy)
b)Jumps from higher energy level to lower energy level(Loses energy)
1)An atom is made up of three particles:electrons,protons and neutrons.Electrons have negative charge,protons have positive charge whereas neutrons have no charge.Due the presence of equal number of negative electrons and positive protons,the atom on the whole is electrically neutral.
2)The protons and neutrons are located in a small nucleus at the centre of an atom.Due to the presence of protons,nucleus is positively charged.
3)The electrons revolve around the nucleus in fixed circular paths called energy levels or shells.The energy levels or shells are represented in two ways:
a)K,L,M,N…….
b)1,2,3,4,5……
4)The first energy level or k shell can hold maximum of 2 electrons.
The second energy level or L shell can hold maximum of 8 electrons.
The third energy level or M shell can hold maximum of 18 electrons.
The fourth energy level or N shell can hold maximum of 32 electrons.
5)Each energy level or shell is associated with fixed amount of energy.There is no change in energy as long as they keep revolving in same energy level.
6)The change in energy of an electron take place when it
a)Jumps from lower energy level to higher energy level(gain energy)
b)Jumps from higher energy level to lower energy level(Loses energy)
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