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Understanding Atoms Test
Terms in this set (23)
an ion with a positive charge
an ion with a negative charge
Number of protons and neutrons
the number of protons in an atom
An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
negatively charged particle, has no significant mass
positively charged particle
A small particle in the nucleus of the atom, with no electrical charge
Gold foil experiment, discovered nucleus
Dalton's Atomic Theory
1) elements are composed of atoms. 2) atoms of same element are identical, but differ from other elements. 3) elements can mix together 4) atoms only change when mixed with other elements
Cathode ray tube, discovered the electron
calculated charge on an electron by examining the behavior of charged oil drops in an electric field
Atomic Mass Unit; used to indicate mass on an atomic scale. "Mass" of the atom
fundamental unit of charge
a chemical formula of a molecular compound that shows the kinds and numbers of atoms present in a molecule of a compound (CO2)
a formula that shows the arrangement of atoms in the molecule of a compound.(o-C-o)
a chemical formula showing the ratio of elements in a compound rather than the total number of atoms (not C6H12, but CH2)
Dalton's atomic model
Solid sphere model
Thomson's atomic model
Atoms have small negative charges embedded in a positive matrix. "Plum Pudding"
Rutherford's atomic model
Atoms have a small, dense, positive center (nucleus) surrounded by an "empty space" where negative charges are located.
An atom or group of atoms that has a positive or negative charge.
Two different molecules that have the same chemical formula
Same formula but different structures