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25 Cards in this Set

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Atom
is the smallest piece of an element that still represents that element
Electron
is a particle with one negative charge
Nucleus
most of an atoms mass and positive charge is concentrated in a small area in the center of an atom is the ______
Proton
is an atomic particle with a positive charge
Neutron
is a neutral particle that exist in the nucleus of an atom
Electron Cloud
is an area around an atomic nucleus where an electron is most likely to be located
Quark
any of a number of subatomic particles carrying a fractional electric charge
Atomic Number
the number of protons in the an atom of an element
Isotope
atoms of the same element that have different numbers of neutrons
Mass Number
is the sum of the number of protons and neutrons in an atom
Average atomic mass
is the average mass of an elements isotopes, weighted according to the abundance of each isotope
Radioactive
elements that spontaneously emit radiation
Nuclear Decay
is the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation
Ion
is an atom that is no longer neutral because it has gained or lost electrons
Chemical Bond
is a force that holds two or more atoms together
Valence electron
is an outermost electron of an atom that participates in chemical bonding
Electron dot diagram
is a chemical bond formed two atoms share one or more pairs of valence electrons
Orbital diagram
are pictorial descriptions of the electrons in an atom.
Electron Configuration
is the distribution of electrons of an atom or molecule
Covalent bond
is a chemical bond formed when two atoms share one or more pairs of valance electrons
Molecule
is a group of atoms held together by covalent bonding that acts as an independent unit
Polar molecule
a molecule that has a partial positive end and a partial negative end because of unequal sharing of electrons
Chemical Formula
is a group of chemical symbols and numbers that represent the elements and the number of atoms of each elements that make up a compound
Ionic bond
the attraction between positively and negatively charged ions in an ionic compound
Metallic bond
is a bond formed when many metal atoms share their poled valance electrons