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15 Cards in this Set

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Matter
Anything that takes up space or has mass.
Atom
The smallest unit of matter that still retains the properties of an element.
Electron
Subatomic particle, orbiting the nucleus, with negligable mass and a negative charge.
Atomic Mass Number
The number of protons and neutrons in the nucleus of an atom.
Energy Level
Any of several different states of potential energy for electrons in an atom.
Valence Electron
An electron in the outermost shell.
Covalent Bond
A type of strong chemical bond in which two atoms share one or more pairs of valence electrons.
Electronegativity
The attraction of an atom for the electrons of a covalent bond.
Polar Covalent Bond
A covalent bond between atoms that differ in electronegativity. The shared electrons are pulled closer to the more electronegative atom, making it slightly negative and the other atom slightly positive.
Anion
A negatively charged ion.
Element
Any substance that cannot be broken down to any other substance.
Neutron
An electrically neutral particle (a particle having no electrical charge), found in the nucleus of an atom.
Atomic Nucleus
An electrically neutral particle (a particle having no electrical charge), found in the nucleus of an atom.
Electron Shell
An energy level represented as the distance of an electron from the nucleus of an atom.
Valence Shell
The outermost energy shell of an atom, containing the valence electrons involved in the chemical reactions of that atom.