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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 |
Created by:
nancy johnson