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atomic model timeline part1

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atomic model timeline part1

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  1. Atomic model: John Dalton • Matter is made of small indivisible atoms. • Atoms can’t be subdivided, created or destroyed.2.1 Atoms of the same element have the same property.2.2 Atoms of different elements have different properties. • 3. Atoms of different elements can form compounds.

  2. Plum-pudding model: J.J. Thomson • An atom is electrically neutral. It has no charge. • In an atom, both positive charges and negative charges are equal. • An atom is made out of a sphere of positive charges with negatively charged electron embedded in it.

  3. Nuclear model: Ernest Rutherford • Atoms are mostly empty space. • Most of the mass is concentrated in the center of atom. This tiny, dense, positively charged core called a nucleus. • Electrons are located outside the nucleus.

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