Inside The Atom 8 th 2.1 The Story of the Atom. The Story of the Atom Element – substance that cannot be broken down into simpler substances Element –

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Presentation transcript:

Inside The Atom 8 th 2.1 The Story of the Atom

The Story of the Atom Element – substance that cannot be broken down into simpler substances Element – substance that cannot be broken down into simpler substances Atoms-make up elements and are made up of subatomic particles. Atoms-make up elements and are made up of subatomic particles. John Dalton believed that atoms are like hard spheres and same throughout. John Dalton believed that atoms are like hard spheres and same throughout. William Crookes created the cathode ray tube and found charged particles. William Crookes created the cathode ray tube and found charged particles.

The Story of the Atom

J.J. Thomson used the cathode ray tube to determine that atoms have electrons and protons. J.J. Thomson used the cathode ray tube to determine that atoms have electrons and protons. Electrons - negatively charged particles Electrons - negatively charged particles Protons – positively charged particles. Protons – positively charged particles. Thompson derived that atoms have positive and negative charges scattered throughout. Thompson derived that atoms have positive and negative charges scattered throughout.

The Story of the Atom

Ernest Rutherford determined that atoms have a nucleus using gold foil. Ernest Rutherford determined that atoms have a nucleus using gold foil. Nucleus – center of an atom containing protons and neutrons Nucleus – center of an atom containing protons and neutrons Neutrons – neutral (no) charged particle. Neutrons – neutral (no) charged particle. Electrons travel outside of the nucleus in a cloud called the Electron Cloud. Electrons travel outside of the nucleus in a cloud called the Electron Cloud. Electrons don’t stand still and travel close to the nucleus. Electrons don’t stand still and travel close to the nucleus.

The Story of the Atom