Chemistry abc

CHEMISTRY ABCTHE BASICS

SUB ATOMIC PARTICLES

PROTONS

POSITIVE CHARGE

NEUTRONS

NO CHARGE

ELECTRONS

NEGATIVE CHARGE

+

Mgz

AMASS NUMBER

ATOMIC NUMBER

Mg12

24

A = Z + N

Number of neutrons = 12

24 = 12 + N

WHY THEY LOOK AND BEHAVE SO DIFFERENT

EVEN THOUGH THEY ARE MADE OF THE SAME THREE

BASIC PARTICLES?

BECAUSE THE PHYSICAL AND CHEMICAL

PROPERTIES DEPENDS UPON THE AMOUNT OF

THEM

Fe26

56

H1

1

C6

12

He2

4

How many?

118

92H

U

1

92

Dalton’s atomic theory

Atoms are the smallest and indivisible part of

matter.

They are considered as building block of matter.

Everything around us in the universe is made up

of atom.

Any substance composed of only single type of atom constitutes

an element.

MODERN ATOMIC THEORY

Atoms are divisible and destructible.

They are divisible into sub atomic particles such as electrons, protons and neutrons.

Atoms of the same element may not be identical in all respect.

Atomic Models

Rutherford’s Atomic Model

Bohr’s Atomic Model