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study for midterm

protons positive charge
electron negative charge
neutron neutral charge
Isotope An atom of the same element that differ in the number of neutrons. (masses vary)
Ion Atoms that gain or lose electrons.
Valence Electrons Electrons that are located in an atoms highest energy level. They determine physical and chemical properties of an element.
Electrovalent A type of bond formed between oppositely charged ions in a chemical compound.
Covalent Form when atoms share electrons.
fundamental unit A unit adopted for measurement of a base quantity. (basic measurement)
derived unit units formed from other units.
exothermic gives off energy
endothermic takes in energy
metals give electrons
non-metals take electrons
pure substance sample of matter with the same composition and properties whatever its source
heterogeneous composition and properties are not uniform
homogeneous composition and properties are uniform throughout the mixture
matter anything that has mass and takes up volume
atom basic unit of matter
scientific notation uses powers of 10 to write very large or very small numbers in shorter form.
centi 1g=100cg
mili 1g=1000mg
micro 1g=100mg
kilo 1g=1000kg
Created by: shelleyw