Atomic Theory
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Last updated 2:29 AM on 2/15/23
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32 Terms
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atom
smallest particle that can still be considered an element
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electron
negatively charged particles
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throughout
atoms have negatively charged particles _
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chocolate chip cookie
what is an example of electrons in an atom?
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nucleus
dense center
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proton
positively charged particle
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nucleus
positively charged particles are found in the _
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specific
electrons move in _ orbits
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fixed
each electron orbit has a _ energy
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1. found in the nucleus
2. rutherford
3. positive
4. # of protons=atomic #
protons are:
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1. found on outside of nucleus
2. thomson
3. negative
4. # of electrons=atomic #
electrons are:
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1. found in nucleus
2. chadwick
3. neutral
4. atomic mass-atomic number = neutrons
neutrons are:
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atomic number
number of protons in an atom of an element
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different
atoms of different elements have _ numbers of protons
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neutral
because an atom is _ the atomic # also equals the number of electrons
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mass number
the sum of protons and neutrons in an atom
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isotopes
atoms of the same element that have different numbers of neutrons and different mass numbers
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different
isotopes of an element have the same atomic # but _ mass #’s because they have different #’s of neutrons
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protons= Ernest Rutherford; neutrons= James Chadwick
who discovered neutrons and who discovered protons?
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\+protons and -electrons \*they are the same/equal
what 2 things can you determine from the atomic number?
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false
true/false? all atoms in the environment are equal
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Bohr’s Model
what model did Neil Bohr discover?
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thomson
what scientist compared electrons in an atom to chocolate chip cookies?
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true
true/false? each electron orbit hasa fixed energy level
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dalton
who discovered atoms?
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rutherford
what scientist theorized that atoms contained a dense center called a nucleus?
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energy levels
the possible energies that electrons in an atom can have
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electron cloud
visual model of the most likely locations for electrons in an atom
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orbitals
region of space around a nucleus where electrons are most likely to be found
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behave
electron clouds let us know how electrons _ in their orbitals
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loses
an electron in an atom can move from one energy level to another when the atom gains or _ energy
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1. 2
2. 8
3. 18
4. 32
what are the 4 numbers for the rings in a bohr’s model
