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Atoms Chapter 9

Horizontales
A small particle that is the building block of matter.
A neutral particle in the nucleus on an atom
The average mass of the element's isotope, weighted according to the abundance of each isotope.
A negatively charged particle that occupies the space in an atom outside the nucleus.
The number of protons in an atom of an element
Any element that spontaneously emits radiation.
Verticales
Atoms of the same element that have different numbers of neutrons
The sum of the number of protons and neutrons in an atom
An atom that is no linger neutral because it has lost or gained valence electrons.
A process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation.
The region surrounding an atom's nucleus where one or more electrons are most likely to be found
The region int he center of an atom where most of the atom's mass and positive charge are concentrated.
Positively charged particles int he nucleus of the atom.