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Atomic Theory
The Structure of an Atom
The Parts of an Atom

The atom is made of 3 distinct particles

The Proton

The Neutron

The Electron
The Proton

Location


Charge


The Proton has a positive charge [+]
Mass


The Proton is found in the centre of the atom called
the Nucleus
The Proton has a mass of 1 amu.
Symbol
+
 p
The Neutron

Location


Charge


The Neutron has no charge [o]
Mass


The Neutron is found in the centre of the atom called
the Nucleus
The Neutron has a mass of 1 amu.
Symbol

no
The Electron

Location


Charge


The Electron has a negative charge [-]
Mass


The Electron is found in paths moving outside the nucleus.
The Electron has a mass of 0 amu. (1/1850 amu)
Symbol
 e
The Structure of an Atom
Summary

{ COMPLETE THIS TABLE }

PARTICLE
SYMBOL
LOCATION
CHARGE
MASS
Facts about Atoms

Atoms have equal numbers of protons and electrons.
No. of Protons = No. of Electrons.

The number of protons is called the
Atomic Numbers

Elements are arranged in the periodic table in order of
increasing Atomic Number.

amu = atomic mass unit.
Examples
{Complete the examples}

Hydrogen
: H : Atomic No.1 = 1p+ 1e-

Helium
: He :

Aluminium
: Al :

Chlorine
: Cl :