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19 Cards in this Set
- Front
- Back
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In the current PTE is organized by increasing
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Atomic Number
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Mendleev's table was organized by increasing
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Atomic Mass
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The rows are called
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Periods
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The colunms/groups/families share
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Similar Properties
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Taking away or gaining a neutron makes the element a what?
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Isotope
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Taking away or gaining a electron makes the element a what?
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ION
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Taking away or gaining a proton makes the element a what?
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a new element
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Who founded the PTE?
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Mendleev
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How much do electrons weigh compared to protons and neutrons?
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1 in 2000s
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The sections of the pte are
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metals, nonmetals, noble gasses, transitional metals, reactive metals, other metals, metaloids.
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The element box shows what things?
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the atomic # the proton# the electron # the name symbol mass and AVG.# OF NEUTRONS
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How do you find the average number of neutrons?
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minus the number of protons from the element mass
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Define matter
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anything that has mass and takes up space
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Define an element
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something that cannot be broken down any further (a prime #)
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What is in the nucleus?
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the protons and neutrons (middle of the atom)
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What is an electron cloud?
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all the electrons spinning around
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What is the unit for measuring the mass of atoms?
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AMU (atomic mass units)
1proton=1 AMU 1 neutron= 1 AMU |
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Taking away an electron gives the atom what charge?
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a +1 charge or a positive charge
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Does atomic size decrease or increase when it goes from top to bottom in a group?
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increases
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