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7th & 8th Gr. Molecule (2022-23)

Terms in this set (15)

atom
smallest particle of an element. They are a single unit.
molecule
a group of atoms bonded together
shell/orbital/cloud
the outer ring of electrons
subscript
a number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.
coefficient
a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
chemical equation
a short, easy way to show a chemical reaction, using symbols.
compound
a substance made up of atoms of two or more different elements joined by chemical bonds
chemical formula
a combination of chemical symbols and numbers to represent a substance
protron
a positively charged subatomic particle found in the nucleus of an atom
neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom
electron
A subatomic particle that has a negative charge
chemical bond
the force that holds two atoms together
valance electrons
the number of electrons in the outermost energy level
ratio
a comparison of two numbers by division
pure substance
a substance made of only one kind of matter and having definite properties.
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