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What is an atom?
Atoms are everywhere They form everything in
the universe.
Atoms are comprised of three subatomic
particles: NEUTRONS, PROTONS and
ELECTRONS…read more

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Information about subatomic
particles:
Subatomic Particle Mass Charge
Neutron 1 Neutral
Proton 1 Positive
Electron Almost Nothing Negative
In an atom the number of protons and electrons is equal.
This makes atoms neutral.…read more

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Structure of an atom:
The protons (+) and
neutrons (neutral) form
the nucleus in the centre
of the atom.
- -
+ +
+ -
- +++ + -
- - + + -
+
The electrons (-) form "Electron - -
shells" around the nucleus.
They are attracted to the positive
protons in the nucleus. This holds
the atom together.…read more

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Mass number =
Number of protons
Mass number and neutrons in the
nucleus
H
1 Atomic Number =
Number of Protons
on the nucleus
1
Atomic / Proton
Number E.g. (For Hydrogen)
Protons = 1
Neutrons = 0
Electrons = 1…read more

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Isotopes
An isotope is a atom of the same The number of Protons
element that has a different stays the same.
number of Neutrons...
Cu Cu
63 65
29 29
Protons = 29 Protons = 29
Electrons = 29 Electrons = 29
Neutrons = 34 Neutrons = 36…read more

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