| Term | Definition |
|---|
| Mendeleev | periodic table arranged by atomic weight and properties |
| Moseley | improved Mendeleev's table by arranging elements by atomic number |
| Seaborg | took out inner transition elements |
| alkali metals | large atomic radii, low ionization, metallic, low electronegativity |
| alkaline earth | low electron affinity, low electronegativity, |
| halogen | high electronegativity, highly reactive |
| noble gases | fairly nonreactive, high ionization, low electronegativity, low boiling point |
| inner transition | lanthanide, actinide, |
| transition | low ionization, hard, high melting and boiling points, good conductors, malleable, |
| periods | across |
| groups | down |
| anion | negative ion |
| cation | positive ion |
| electronegativity | measure of the ability of an atom in a chemical compound to attract electrons |
| electron affinity | energy change that occurs when an electron is acquired by a neutral atom |
| ionic radii | one-half the diameter of an ion in an ionic compound |
| atomic radii | one-half of the distance between the nuclei of identical atoms joined in a molecule |
| ionization energy | the energy required to remove one electron from an atom of an element |
| periodic law | the physical and chemical properties of the elements are periodic functions of their atomic numbers |
| periodicity | repeating patterns that have certain rules |
| metals | element that is a good conductor of heat and electricity |
| metalloids | an element that has some properties of metals and nonmetals, semiconductor |
| nonmetals | element that is a poor conductor of heat and electricity |
| law of conservation of mass | matter cannot be either created or destroyed in ordinary chemical or physical changes |
Combine with other sets
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