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Name _____________________________________________Date___________Period Elements, Compounds, and Atoms Video Notes 1. Pure substance – matter made of 1 kind of material with . 2. Element - simple pure substance that can’t be changed into a . 3. atmos – Greek word for “ ” or “indivisible”. 4. Atom – the smallest piece of matter that broken down. be commonly 5. John Dalton – An English chemist whose work led to widespread acceptance of the idea of the existence of . 1. All matter is made of that can be combined. 2. Atoms of same element are . 3. Atoms of different elements are . 4. Atoms of two or more elements can be combined to form new . 6. Thomson’s Model of the Atom – late 19th century scientist who stated atoms were not simple solid spheres. He discovered . 7. Electrons – small particles located outside the nucleus and have a charge. 8. Ernest Rutherford’s Model of the Atom – developed a more complete understanding of the structure of atoms. He used gold foil and gold atoms. He discovered that atoms are mostly made of . 9. Nucleus – positively charged particles are scattered outside the nucleus around the of the atom. Negatively charge of the atom. 10. Neils Bohr – proposed that electrons orbit around the nucleus; each electron has a fixed amount of energy and electrons orbit in around the nucleus. (Think of the rungs on a .) 11. Electron Cloud Model – the region where electrons would probably be found swirling around the of an atom. 12. Compounds – pure substance made of more than 1 . 13. Molecules – 2 or more atoms with specific properties that have together. 14. Chemical symbol – 1 or two letters used to represent an 15. Chemical formula – for chemical substances. .