Atomic Theory

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32 Terms

1

atom

smallest particle that can still be considered an element

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2

electron

negatively charged particles

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3

throughout

atoms have negatively charged particles _

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4

chocolate chip cookie

what is an example of electrons in an atom?

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5

nucleus

dense center

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6

proton

positively charged particle

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7

nucleus

positively charged particles are found in the _

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8

specific

electrons move in _ orbits

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9

fixed

each electron orbit has a _ energy

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10
  1. found in the nucleus

  2. rutherford

  3. positive

  4. of protons=atomic

protons are:

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11
  1. found on outside of nucleus

  2. thomson

  3. negative

  4. of electrons=atomic

electrons are:

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12
  1. found in nucleus

  2. chadwick

  3. neutral

  4. atomic mass-atomic number = neutrons

neutrons are:

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13

atomic number

number of protons in an atom of an element

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14

different

atoms of different elements have _ numbers of protons

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15

neutral

because an atom is _ the atomic # also equals the number of electrons

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16

mass number

the sum of protons and neutrons in an atom

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17

isotopes

atoms of the same element that have different numbers of neutrons and different mass numbers

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18

different

isotopes of an element have the same atomic # but _ mass #’s because they have different #’s of neutrons

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19

protons= Ernest Rutherford; neutrons= James Chadwick

who discovered neutrons and who discovered protons?

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20

+protons and -electrons *they are the same/equal

what 2 things can you determine from the atomic number?

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21

false

true/false? all atoms in the environment are equal

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22

Bohr’s Model

what model did Neil Bohr discover?

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23

thomson

what scientist compared electrons in an atom to chocolate chip cookies?

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24

true

true/false? each electron orbit hasa fixed energy level

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25

dalton

who discovered atoms?

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26

rutherford

what scientist theorized that atoms contained a dense center called a nucleus?

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27

energy levels

the possible energies that electrons in an atom can have

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28

electron cloud

visual model of the most likely locations for electrons in an atom

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29

orbitals

region of space around a nucleus where electrons are most likely to be found

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30

behave

electron clouds let us know how electrons _ in their orbitals

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31

loses

an electron in an atom can move from one energy level to another when the atom gains or _ energy

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32
  1. 2

  2. 8

  3. 18

  4. 32

what are the 4 numbers for the rings in a bohr’s model

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