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Ch 19 integrated science

Terms in this set (37)

Element
Matter composed of one type of atom
Atom
Smallest piece of matter, still retains property of element
Nucleus
Positively charged center of an atom
Protons
Found in nucleus with a positive electric charge
Protons
Different atoms have different number of what, which are the fingerprints of an element
Protons
Atomic number = number of what
Neutrons
Found in nucleus with no charge; neutral
Neutrons
By subtracting the number of protons from the atomic mass, you get the number of what
Electron
Located outside nucleus with negative charge
When the atom is neutral, protons = this
Quarks
-Smaller than protons and neutrons; science has confirmed 6
-found in nucleus
Democritus
-400-460 bc
-developed atomic theory
-1st
Democritus's uncuttable atom
-Atoms= means uncuttable
Thomson model
-1904
-ball of positive charge
-negative charged electrons
-4th
Rutherford model
-1911
-empty space containing electrons
-positively charged nucleus
-5th
Bohr model
-1913
-electrons travel in orbits
-6th
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