Atomic History

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Atoms

Particles that make up all substances in the universe

Made up of : Protons, Neutrons & Electrons

Nucleus

Nucleus is a dense bundle of Protons and Neutrons. Protons have positive charge whereas Neutrons have no charge.

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Electrons

Electrons spin around in the space surrounding the nucleus. They are negatively charged and are attracted towards Positive Nucleus. Number of electrons is same as number of Protons therefore atom is neutral.

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Elements

Atoms are the smallest unit. Element is made up of more atoms. There are 118 elements out of which 26 are not found on earth.

Compounds

It is made up of two or more elements. The most compound NaCl (salt) is made up of Sodium and Chlorine.

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Atomic Number

The number of protons in the nucleus of an atom is known as Atomic Number.

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Metals Vs Non-Metals

The metals become more reactive as you go down the group and less reactive as you go left to right.

The non-metals become less reactive as you go down the group and more reactive as you go left to right .

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Electron Configuration

Fills electrons from the lowest shell

If there are more than 4 electrons in a shell they pair up

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