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CH 4 Chem Vocab

atom the smallest particle of an element that retains its identity in a chemical formula
Democritus believed that atoms were indivisible and and indestructible
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.
electrons negatively charged, floating around nucleus. number is the same as protons
protons positively charged. inside the nucleus, same number as atomic number
neutrons no charge, inside nucleus. atomic mass - proton = # of neutrons
nucleus tiny central core of an atom composed of protons and neutrons. positively charged
Rutherford gold foil experiment - atoms are made up if mostly empty space with a small dense nucleus in the center
Thomson cathode ray, discovered that electrons have a negative charge.
Bohr proposed that an electron is found only in orbits, around nucleus
period the horizontal rows on a periodic table
group each vertical column of the periodic table
atomic mass unit (AMU) unit used when finding relative abundance
Isotopes atoms that have the same number of protons but different number of neutrons
What are the three parts of an atoms? proton, neutron, electron
Created by: missphysicsteach



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