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30 Cards in this Set
- Front
- Back
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a positively charged subatomic particle found in the nucleus of an atom
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proton
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a subatomic particle with no charge and a mass of 1 amu found in the nucleus of the atom
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neutron
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the smallest particle of an element that retains the properties of that element
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atom
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a negatively charged subatomic particle
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electron
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the dense central portion of an atom composed of protons and neutrons
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nucleus
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the total number of protons and neutrons in the nucleus of an atom
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mass number
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the number of protons in the nucleus of an atom of an element
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atomic number
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the weighted average of the masses of the isotopes of an element
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atomic mass
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a unit of mass equal to one twelfth the mass of a carbon 12 atom
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atomic mass unit
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atoms of the same element that have the same atomic number but different atomic masses due to a different number of neutrons
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isotopes
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name the relative mass of each
electron proton neutron |
0
1 1 |
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he discovered electrons that come off of different metals
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thompson
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he discovered the neutron
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chadwick
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he figured out the charge on an element
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milliken
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fired helium nuclei that went through gold
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rutherford
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he said the items of same element are identical
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dulton
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how do you figure out the atomic number of an element
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count the protons
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what is an amu equal too
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1 12th of carbon twelve
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where do you find inner transition elements on the periodic table
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they are the elements farthest down on the bottom of the table
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where do you find represenitive elements on the periodic table
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the elements sticking out at the top
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what group are transition elements in
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group B
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where are transition elements found on the periodic table
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they are found in between the represenitive and the inner transition elements
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how many elements are naturally accouring
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94
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describe how small an atom is
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there are more atoms on a penny than there are people on earth
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what is the basic structure of an atom
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protons and neutrons in the nucleus
then the electrons are in the electron cloud |
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how does the atomic number identify the element
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it tells you how many protons are in the element
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which way do columns in the periodic table go
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up and down
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which way do rows in the periodic table go
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left and right
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how many columns are in the periodic table
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18
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how many periods are in it
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7
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