Please enable JavaScript.
Coggle requires JavaScript to display documents.
ATOMIC MODELS AND ITS THEORY - Coggle Diagram
ATOMIC MODELS AND ITS THEORY
PLANETARY MODEL
HE THEORISED THAT:
•Electrons orbit the nucleus in orbits that have specific size and energy.
•The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit.
•When gaining energy, electrons move to farther orbit from the nucleus.
•When losing energy, electrons move to closer orbit from the nucleus.
•Electrons reside in orbits. They move between each shell when gaining or losing energy.
IT WAS PROPOSED BY
NIELS BOHR
WAS PROPOSED ON
1913
NUCLEAR MODEL
HE THEORISED THAT
Atoms are mostly empty space.
Most of the mass is concentrated in the center of atom. This tiny, dense, positively charged core called a nucleus.
Electrons are located outside the nucleus.
IT WAS PROPOSED BY
ERNEST RUTHERFORD
WAS PROPOSED ON
1911
ATOMS
THE WORD ATOM COMES FROM THE G
REEK WORD ATOMOS
WHICH MEANS
"UNCUTABLLE"
OR
"INDIVISIBLE
ATOMS ARE THE
SMALLEST BUILDING BLOCK OF LIFE
EVERY SOLID, LIQUID, GAS AND PLASMA IS COMPOSED OF NEUTRAL OR IONIZED ATOMS
THE
BASIC PARTICLES
THAT MAKE UP AN ATOM ARE ELECTRONS PROTONS AND NEUTRONS
AN ATOM IS THE
SMALLEST UNIT
OF ORDINARY MATTER THAT FORMS A CHEMICAL ELEMENT
PLUM-PUDDING MODEL
HE THEORISED THAT:
In an atom, both positive charges and negative charges are equal.
An atom is made out of a sphere of positive charges with negatively charged electron embedded in it.
An atom is electrically neutral. It has no charge.
IT WAS PROPOSED BY
J.J THOMSON
WAS PROPOSE ON
1904
QUANTUM MECHANICAL MODEL
HE THEORISED THAT:
Electrons don’t move around the nucleus in orbits.
Electrons exist in specific energy levels as a cloud.
The electron cloud is the region of negative charges, which surrounds the nucleus.
Orbital : The region with a high probability of containing electrons.
IT WAS PROPOSED BY
ERWIN SHRODINGER
WAS PROPOSED ON
1926
ATOMIC MODEL
IT WAS PROPOSED BY
JOHN DALTON
WAS PROPOSED ON
1808
HE THEORISED THAT
Atoms of different elements can form compounds.
Atoms can’t be subdivided, created or destroyed.
Atoms of the same element have the same property.
Atoms of different elements have different properties.
Matter is made of small indivisible atoms.