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chem 5,13,14

Atomic Structure

mass number the total number of protons and neutrons in the nucleusof the atom
atomic mass the weighted average mass of the atoms in a naturally occuring sample of an element
atomic # the number of protons in the nucleus of an element
isotopes atoms with same numbers of protons but different numbers of neutrons
electrons negatively charged particles
atom the smallest partical of an element that retains the properties of that element
nucleus the central part of the atom, containing protons and neutron
neutron subatomic partical with no charge
proton positively charged subatomic partical
atomic emission spectrum lines of colored light obtained by passing the light emitted by an element through a peism
atomic orbital the region around an atomic nucleus where an electron is likely to be moving
spectrum a range of colors seen when light passes through a prism
energy level probably cloud shape, such as s or p, there is a high probability of finding an electron
quantum of energy the amount of energy required to move an electron level to the next higher one
alkali metal an element in group 1A
ionization energy the energy needed to remove an electron from a gaseous atom
period a horizontal row of the periodic table
halogens the family of nonmetals including fluorine and chlorine
electronegativity the tendency of an atom to attract othe relectrons to itself when it is chemically combined with other another element
noble gas an element in which the outermost s and p sublevels are filled
photoelectric effect a process in which electrons are ejected by metals when light shines on them
ground state the lowest energy level
heisenberg's uncertainty princple it is impossible to know both the volocity and the position of a particle at the same time
photon quantom of light
Created by: nancy johnson



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