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level: Module #13

Questions and Answers List

level questions: Module #13

QuestionAnswer
What three things make up an Atom?Protons, Neutrons, and Electrons.
ModelA schematic description of a system that accounts for its known properties.
NucleusThe center of an atom, containing the protons and neutrons.
Atomic NumberThe number of protons in an atom.
Mass NumberThe sum of the numbers of neutrons and protons in the nucleus of an atom.
IsotopesAtoms with the same number of protons but different numbers of neutrons.
ElementA collection of atoms that all have the same number of protons.
Radioactive IsotopeAn atom with a nucleus that is not stable.
Half-LifeThe time it takes for half of the original sample of a radioactive isotope to decay.