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Atoms are solid sphere and INDIVISIBLE.

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Electrons are particles smaller than atoms and have negative charge.
Electrons are part of all atoms.

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Atom is considered as a divisible particle. The mayority of the mass was concentrated in the positive charges (sphere).

The sphere enclose enough electrons to make an overall neutral charge.

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Description:
A piece of gold foil was hit with alpha particles (radioactive particles which have positive charge).
Results:
Most alpha particles went right through. Same of them were deviated and others were sent straight backwards.
Conclusions:
This showed that the atoms are mostly empty space, so matter is hollow and the idea of Thomson which said that the atoms were solid was rejected.

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- ATOM DIVIDES INTO:
•the nucleus ( very small part, positively charged)
• Electron shell (where the electrons move around the nucleus)
- Generally ATOMS ARE ELECTRICALLY NEUTRAL (positive charge balances negative one)

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In an atom there are discrete orbits or energy levels (K,L,M,N... and numbered as n=1, n=2... from the closest orbit)

Electrons there don't radiate energy. The electrons near the nucleus move slower than far electrons.

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Neutrons are particles without electrical charge. Its mass is similar to the proton mass. Neutrons are located in the nucleus of atoms.

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The modern atomic model represents atoms containing a nucleus of protons and neutrons and a vague gradient or cloud surrounding it containing the electrons (ORBITALS).