Download power point-safiya k mohamed

WELCOME
S.N.T.C
SREEKANDESWARAM
POOCHAKKAL
B.Ed 2013-2014
KERALA UNIVERSITY
Submitted by: Safiya k mohamed
Physical science
Reg no: 133 83 019
SUBMITTED TO
: Linimol miss,
Physical science
Power point presentation on
“BOHR ATOM MODEL”
NIELS BOHR
Was a Danish physicist
who made foundational
contribution to atomic
structure and quantum
theory for which he
received the Nobel price
in physics
BOHR MODEL
•According to the
Bohr model of
atom,
•Electrons are
revolves around
the nucleus in
certain discrete
paths called
“ORBITS”
• In atom electrons are present around the
nucleus in shells
• Each shell have a particular amount of energy,
so shells are called energy levels
• The shell which is more close to the nucleus
have low energy, when the distance increases
energy also increases.
• In bohr model 1st, 2nd,3rd,4th,5th energy levels
are known as K,L,M,N,O shells respectively.
Atomic number & Mass number
The number of protons in an atom is called its
atomic number(Z).
Atomic number = no: of protons = no: of
electrons
The total no: of particles in the nucleus is
called mass number (M). It is the sum of the
no: of protons and neutrons.
Mass number + no: of protons + no: of neutrons
Eg:
In Lithium,
Mass no: =7
Atomic no: =3
So, no: of
electrons= 3
Protons = 3
Neutrons =4
CONCLUSION
Thus Neils bohr had developed a
simple and scientific way to
express the structure of atom by
his Bohr model.