ECS Physical Science Ch4 Sec 2 Atom Structure

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Unable to be cut or divided

Is equal to one-twelfth of the mass of a carbon-12 atom

The sum of the numbers of protons and neutrons in the nucleus of an atom

A subatomic particle that has a positive charge and that is located in the nucleus of an atom.

The SI base unit used to measure the amount of a sbustance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon-12

An atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons

An atom's central region, which made up of protons and neutrons

Subatomic particle that has a negative charge and moves around the outside of the nucleus