4. Niels Bohr's
atomic
model
Bohr's model explained
why atoms emit distinct
frequencies of light
Nucleus
The positive center of an
atom is dense
Electron
Shells
The arrangement of
electrons in shells is
known as the electron
configuration
5. Structure of Atoms: A Timeline
The concept of
Atoms' existence
came in 400 B.C.
400 B.C. - GREEKS
THOUGHT ATOMS
ARE SMALLEST
PARTICLES
In 1964, Murray Gell-
Mann proposed
Quarks
1803 - JOHN
DALTON
PROPOSED
ATOMIC
THEORY In 1995, Bose-
Einstein condensates
was discovered
1897 - J.J.
THOMSON
DISCOVERED
THE ELECTRON
In 2012, the Higgs
boson was
discovered
1913 - NEILS
BOHR
PROPOSED
PLANETARY
MODEL OF
ATOM
6. Atoms consist of electrons, protons, and
neutrons.
ATOMIC NUMBER IMPORTANCE
The number of protons in an atom's nucleus
is called the atomic number.
Atomic Structure in Brief
ATOM COMPONENTS
ELECTRONS' LOCATION
Electrons are found in shells around an
atom's nucleus.
PROTONS AND NEUTRONS
Protons and neutrons are found in the
nucleus of an atom.
7. The smallest unit of matter is an
atom. It has the properties of an
element. An atom comprises a
dense core called a nucleus,
surrounded by a series of outer
shells.
8.
9. TWO OR MORE ATOMS
TIGHTLY BOUND TOGETHER
FORM A MOLECULE. THE
MOLECULES MADE UP OF
TWO ATOMS ARE KNOWN
AS DIATOMIC.
