Atoms

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Atoms: a nucleus with electrons surrounding it

Neutrons = neutral

Electrons = negative (-1)

Protons = positive (+1)

Mass number = number of protons and neutrons contained

Proton number --->

Chemical symbol --->

Full chemical symbol break down

Electronic Structure

Lowest energy shell (innermost one) fills up first. The first shell can hold up to 2 atoms, the second can hold 8 as can the third.

This is how you draw an atom. The electrons are split up between the shells, innermost having the first 2. The amount of electrons can be found from the chemical symbol. (There are the same amount of protons and electrons in a stable atom.)

Neutron number

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