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#1 What does an atom looks like? What are the sub-atomic particles inside it.....(talk about electrons, neutrons, protons, electron shells, nucleus....)

An atom looks like a nucleus surrounded by an orbital electron shell.
An atom consists of sub-atomic particles such as:

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Protons

-carries one positive electric charge (+1)

-has a relative mass of 1

-is represented by the symbol, p

Neutrons

-carries no electric charge

-has a relative mass of 1

-is represented by the symbol, n

Electrons

-carries one negative electric charge (-1)

-has a relative mass of 1/1840 (negligible)

-is represented by a symbol, e

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These particles are even smaller than the atoms themselves. They are called sub-atomic particles.

The protons and neutrons are found in the nucleus of the atom. These two particles that make up the nucleus are known as nucleons.

Electrons move rapidly around the nucleus in definite energy levels or electron shells.

http://www.antonine-education.co.uk/physics_as/module_1/topic_1/Atom_1.gif