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15 Cards in this Set

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Element
fundamental form of matter that occupies space, has mass, and cannot be broken apart into a different form of matter by ordinary physical or chemical means
Atom
the smallest particles that retain the properties of an element
Proton
located in the center of the nucleus, it has a charge of +1, and a mass of approximately 1 atomic mass unit (amu). A proton without an electron zipping around it is a hydrogen ion (H+)
Electron
a very small particle located outside the nucleus, it has a charge of -1 and its mass in negligible (approx. 1800 electrons is equivalent to1 proton)
Neutron
also is located in the atomic nucleus; it has no charge and a mass of slightly over 1amu.
Matter
anything that has mass and occupies space
Energy
the capacity to do work
Atomic Number
number of protons an atom has
Atomic Mass
is the number of protons and neutrons in an atom
Isotope
atoms of an element that have differing numbers of neutrons (but a constant atomic number)
Radioisotope
an isotope that has an unstable nucleus and stabilizes itself by spontaneously emitting energy and particles
Tracer
the molecule of a substance to which a radioisotope is attached. In conjunction with tracking devices, it can be used to follow the movement or destination of that substance in a metabolic pathway, the body, etc.
Shell Model
is a simple although not quite accurate way to think about how electrons are distributed in some atoms
Chemical Bond
a union between the electron structures of atoms
Inert Atoms
a atom that has no vacancies, they show little tendency to enter chemical reactions