IPC
Terms
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- mass number
- the totaly number of protons and neutrons in the neucleous of an atom
- valence electron
- an electron in the outermost energy level of an atom
- Atomic mass unit
- a quantity equal to one twelfth the mass of a carbon-12 atom
- Atomic number
- the number of protons in the nucleus of an atom
- transition metals
- the metalic elements located in groups 3-12 of the periodic table
- average atomic mass
- the weighted average of the masses of all naturally occurring isotopes of an electron
- periodic law
- the properties of elements tend to repeat in a regular patern when elements are arranged in order of increasing atomic number
- group
- a verticle colum of elements in the periodic table also called a family
- Energy Level
- any of the possible energies an electron may have in an atom
- orbital
- a region in an atom hwere there is a high probability of finding electrons
- noble gases
- the unreactive gaseous elements located in group 18 of the PTE
- period
- a horizontal row of elements in the periodic table
- alkali metals
- the higly reactive metallic elements located in group 1 of the periodic table
- halogens
- the higly reactive elements located in group 17 of the periodic table