CH 4 Chem Vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| atom | the smallest particle of an element that retains its identity in a chemical formula
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| Democritus | believed that atoms were indivisible and and indestructible
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| What are the five parts of Dalton Atomic Theory? | 1) All matter is made of atoms. 2) Atoms of the same element are identical. 3) Each element has different atoms. 4) Atoms of different elements combine in constant ratios to form compounds. 5) Atoms are rearranged in reactions.
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| electrons | negatively charged, floating around nucleus. number is the same as protons
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| protons | positively charged. inside the nucleus, same number as atomic number
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| neutrons | no charge, inside nucleus. atomic mass - proton = # of neutrons
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| nucleus | tiny central core of an atom composed of protons and neutrons. positively charged
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| Rutherford | gold foil experiment - atoms are made up if mostly empty space with a small dense nucleus in the center
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| Thomson | cathode ray, discovered that electrons have a negative charge.
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| Bohr | proposed that an electron is found only in orbits, around nucleus
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| period | the horizontal rows on a periodic table
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| group | each vertical column of the periodic table
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| atomic mass unit | (AMU) unit used when finding relative abundance
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| Isotopes | atoms that have the same number of protons but different number of neutrons
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| What are the three parts of an atoms? | proton, neutron, electron
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