click below
click below
Normal Size Small Size show me how
chem 5,13,14
Atomic Structure
Question | Answer |
---|---|
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 |