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The Structure of the Atom
Protons, neutrons, and electrons are types of sub-atomic particle.
Each element has a unique combination of the three types of
sub atomic particles...
= Neutrons = Protons = Electrons
N.B. This diagram represents a lithium atom. In reality, the
electrons are very much smaller than the neutrons or protons.…read more

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Sub-Atomic Particles ­ Mass and Charge
Charge Mass
Protons 1
Neutrons
0 1
Electrons 1/1840
The charges on the proton and electron are opposite but equal in
magnitude, so they cancel each other out exactly.…read more

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The Atom ­ Sub Atomic Particles
For each particle drag and drop the correct answers into the table.…read more

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The Atom ­ Atomic Number and Atomic Mass
To describe an atom fully, we need to know the numbers of
each type of sub-atomic particle in the atom.
We use these numbers to generate the atomic number and the
mass number of the atom.
The atomic number is the number of protons in an atom.
The mass number is the sum of protons and neutrons in the atom.
N.B. The electrons have an insignificant mass.…read more

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The Atom ­ Atomic Number and Atomic Mass
An atom of Lithium (Li) can be represented as follows:
Mass Number 7
Atomic
Atomic Number 3
Li Symbol
This shows that a Lithium (Li) atom has
three protons, and four neutrons.…read more

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