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science unit 3

worddefinition
element pure substance combined of only one atom
compounds a chemical combination of two or more elements
mixtures a physical combination of two or more elements
molecules a group of atoms bonded together
atoms the smallest particle of a chemical element
protons a particle with a positive electric charge that's found in the nucleus of every atom
neutrons an uncharged particle found in the nucleus of an atom
electrons a particle with a negative electric charge that orbits the nucleus
Lewis Dot Structures A simplified way to show how electrons are arranged in their outer shell
chemical symbol a one or two letter abbreviation for the element
atomic number the number of protons in the nucleus of an atom
period A row of elements across the periodic table (horizontal)
group or family Elements in the same column (vertical)
noble gases a group of non-reactive elements
halogens a group of reactive non-elements
alaki metals any of the chemical elements that make up group 1 of the periodic table
ions atoms or a group of atoms that have an electric charge
ionic bonds the attraction between oppositely changed ions
covalent bonds the chemical bond formed when two atoms share electrons
Created by: user-1936373
 



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