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Atomic Symbol A 1 or 2 letter internationally agreed code for a chemical element, usually derived from the name of the element, often in Latin
Bohr Model A model to illustrate the location of the electrons within the electron cloud of an atom
Periodic Table of Elements table showing the chemical elements arranged according to their atomic numbers
Net Charge The sum of negative and positive charges
Noble Gases Non-reactive gases in Group 18 of the Periodic Table. Outer electron shells are full.
AMU Atomic Mass Units
Atom The smallest unit of an element that has all of the properties of the element containing a nucleus within an electron cloud
Atomic Mass The average mass of an element derived from all the isotopes. Consists mostly of protons & neutrons.
Atomic Number The number of protons in the nucleus of one atom of the element
Electrical Charge A form of charge, designated as negative, positive, or neutral. Subatomic particlesd have electrical charges
Electron e- A negatively charged subatomic particle of the electron cloud; involved in the formation of chemical bonds
Electron Cloud All of the area inside an atom surrounding the nucleus where electrons are found
Electron Shell An orbit followed by electrons around an atom's nucleus
Element A pure substance in its most simplest stage.
Group The columns on a periodic table. Elements in same group (column) have same number valence electrons.
Subatomic Particle Particles smaller then the atom (proton, neutron, electron)
Energy Level Regions around the nucleus of an atom where electrons may be found
Neutron A subatomic particle of the nucleus of an atom without charge and contributes to the mass of an atom
Nucleus The tiny, very dense, positively charged region in the center of an atom; made up of protons and neutrons
Period The rows in a periodic table classifing the elements by the number of atomic shells
Proton p+ A positively charged subatomic particle of the nucleus of an atom and contributes to the mass of the atom
Reactivity The likelyhood an atom combines with other atoms based on valence electrons
Valence Electron Number of electrons in outer most energy level of an atom. Influences how element will react with other substances
Created by: randyoliver



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