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Bohr Model of the Elements

Each share some properties, they all have:
1. protons
2. neutrons
3. electrons

The protons and neutrons are found in the nucleus of the atom and the electrons are found orbiting the nucleus.

The major advantage of the Bohr model was that it worked. It explained several things:
o Periodic behavior of elements - elements with similar properties had similar atomic spectra.
o Each electron orbit of the same size or energy (shell) could only hold so many electrons.
o First shell - two electrons
o Second shell - eight electrons
o Third shell and higher - eight electrons
o When one shell was filled, electrons were found at higher levels.
o Chemical properties were based on the number of electrons in the outermost shell.
o Elements with full outer shells do not react.

Other elements take or give up electrons to get a full outer shell. This is why electrons will react with each other as they "fight" to gain that extra electron to fill the outer shell

Metals tend to give up an electron which is why they have a positively charged ion (more protons in the nucleus than electrons orbiting the atom).

Non metals tend to accept an electron which is why they have a negatively charged ion (less protons in the nucleus than electrons orbiting the atom).
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