Periodic Table Facts

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Periodic Table

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Displays all of the elements in a specific order.

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John Dalton was an English scientist and meteorologist known for his atomic theory in 1808.

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Dalton's atomic theory stated that matter is composed of tiny particles called atoms.

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CaCl₂

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Contains 1 calcium (Ca) atom and 2 chlorine (Cl) atoms.

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CH₃Cl

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Contains 1 carbon (C) atom, 3 hydrogen (H) atoms, and 1 chlorine (Cl) atom.

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Ca₃(PO₄)₂

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Contains 3 calcium (Ca) atoms, 2 phosphorus (P) atoms, and 8 oxygen (O) atoms.

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Al₂(Cr₂O₇)₃

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Contains 2 aluminum (Al) atoms, 6 chromium (Cr) atoms, and 21 oxygen (O) atoms.

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Composition of the Atom: Electrons

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Discovered by J.J. Thomson in 1897 through experiments. Electrons are negatively charged particles, much smaller than atoms, and part of the Plum Pudding Model.

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Protons: Discovery

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Discovered by Ernest Rutherford in 1911. Positively charged. Observed alpha particles deflected by a dense, positive nucleus, leading to the discovery of the nuclear model.

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Who discovered the neutron?

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James Chadwick discovered the neutron in 1932.

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Method used to discover the neutron

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Neutron was discovered by striking beryllium nuclei with alpha particles.