physical science PS.4 - Periodic Table
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Last updated 2:21 PM on 12/30/22
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20 Terms
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groups
vertical columns
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periods
horizontal rows
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atomic mass
the mass of an atom. measured in AMU (atomic mass units)
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atomic number
the number of protons in an atom
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elements in the same group have ---because they have ---
similar properties, same number of valence electrons
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elements are arranged by --- atomic numbers going across the table
increasing
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T/F: The number of protons can change during a chemical or physical change
false
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atomic mass
the average amount of protons and neutrons in an atom
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how many known elements are there?
118
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elements with an atomic number of more than -- are produced in laboratories and aren’t found naturally in earth
92
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isotopes
atoms in an element that have different amounts of neutrons
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ions
when an atomic gains or loses (an) electron(s)
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ions have different --- than their original atom
chemical properties
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where are metals on the periodic table?
the left
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where are metalloids on the periodic table?
the stairstep
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where are nonmetals on the periodic table?
the right
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metallic properties --- from left to right
decrease
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metallic properties --- from top to bottom
increase
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what determines the chemical reactivity of an element?
the number of valence electrons
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what are the 3 categories that elements can be?
metals, metalloids, and nonmetals
Note 
Flashcards (31)