the basic building blocks of matter; the smallest unit of an element that maintains the properties of that element

central part of the atom which is made up of protons and neutrons and where most of the mass is found

subatomic particles that have a positive electric charge

subatomic particles that have no electric charge

subatomic particles that have a negative elective charge

a region around the nucleus of an atom where the electrons are likely to be found

a pure substance made up of entirely the same type of atom; a substance that cannot be broken down into simpler materials

a chart used to organize and arrange the elements in order of their atomic number and in groups with similar properties

the number of protons in an atom

a one-, two-, or three-letter abbreviation of the name of an element; an abbreviation or letters that represent an element

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