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HS Unit 1b

Atoms and the Periodic Table

TermDefinition
Atomic Number the number of protons in an atom; usually the top number on an element tile
Metalloid an element that has characteristics of both metals and nonmetals; borders the zig-zag line
Symbol the 1-2 letter abbreviation for an element; usually found in the center of the element tile
Molecule 2 or more atoms combined together
Periodic Table a table with all 118 elements on it in order of atomic number
Valence Electrons outer shell electrons responsible for bonding
Anion a negative ion
Ion a charged atom
Proton a positively charged subatomic particle, lives in the nucleus
Neutron a subatomic particle with no charge, lives in the nucleus
Period a horizontal row on the periodic table
Nonmetal an element that is brittle, does not conduct electricity and is located to the right of the zig-zag line
Group/Family a vertical column on the periodic table
Cation a positive ion
Atom smallest part of matter
Electron negatively charged subatomic particle, lives outside the nucleus
Nucleus the center of the atom
Metal an element that is shiny, malleable, good conductor or electricity. Located to the left of the zig-zag line
Isotope Atoms of the SAME element that have different number of NEUTRONS
Atomic Mass the number of protons + neutrons in an atom's nucleus, usually located at the bottom of the element tile
Electron Shells the area around the nucleus where electrons are found
Element atoms of 1 type
Compound 2 or more elements chemically combined together
Mixture 2 or more elements and/or compounds physically together
Homogenous mixture a mixture that looks the same throughout
Heterogenous Mixture a mixture that looks different throughout
Pure Substance something that has the same chemical composition; elements and compounds
Created by: user-1977309
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