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Chapter 11 Vocab By: Jason Almas

Across
the sum of the numbers of protons and neutrons in the nucleus of an atom
the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
a unit of mass that describes the mass of an atom or molecule
This states that objects with different charges attract each other and objects with the same charge repel each other.
Plays a key role in the changing of an unstable atom into a proton and an electron
The Smallest Unit of an element that maintains the properties of that element
in physical science, an atom's central region, which is made up of protons and neutrons
Down
Acts between objects all of the time; Pulls objects towards one another
a subatomic particle that has no charge and that is found 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 number of protons in the nucleus is the atomic number, which determines the identity of an element
This keeps the nucleus from being destroyed by say two or more protons repelling one another. The force is stronger than the electro-magnetic force at close distances
the mass of an atom expressed in atomic mass units
a region around the nucleus of an atom where electrons are likely to be found
a subatomic particle that has a negative charge