Question | Answer |
periodic table | a table that lists all the existing elements |
periodic | having a regular repeating pattern |
periodic law | properties of elements are periodic by their atomic numbers |
Dmitri Mendeleev | created the first periodic table |
Henry Moseley | created the second periodic table |
metals | elements that are shiny, good conductors,malleable and ductile |
non-metals | elements that are dull and are poor conductors |
metalloids | elements that have properties of both metals and non-metals |
periods | horizontal rows in the periodic table |
groups | column of elements in the periodic table |
ductile | the ability of a substance to be drawn into a wire |
malleable | the ability of a substance to be pounded into thin sheets |
luster | an object's ability to reflect light |
valence | the electrons in an atom's outer most energy level |
ion | a charged particle that occurs when electrons move from one atom to another |
families of elements | a column in the periodic table, aka, a group |
alkali metals | elements in group 1 |
alkaline metals | elements in group 2 |
transition metals | elements in group 3 |
halogens | elements in group 17 |
noble gases | elements in group 18 |
rare earth elements | metal elements found in group 3 of the periodic tableand the 6th and 7th periods, made of two series: Lanthanide and Actinide |
lanthanides | any of 15 elements from 57-71 that have common properties |
actinides | elements 90-103 and have common properties |
reactivity | the tendency of a substance to undergo chemical reaction, either by itself or with other materials, and to release energy |