Periodic Table Flashcards
Alkali metal
Highly reactive elements that are shiny, soft and silvery
Actinide
Fifteen metallic elements with the atomic numbers 89-103
Alkaline earth metal
Moderately reactive natural elements; Shiny and silvery white
Atomic number
Number of protons in the nucleus of an atom
Halogen
Series of very reactive nonmetals
Isotope
Variant of a chemical element; protons are the same but neutrons vary
Lanthanide
15 metallic elements with atomic numbers 57-71
Metalloid
Mix between metals and nonmetals
Noble gas
Six odorless, colorless gases with low reactivity
Nonmetal
Group of elements that are poor conductors of heat and electricity; dull and brittle
Post transition metal
Metals to the right of transition elements in the periodic table
Rare earth elements
17 elements; lanthanides plus scandium and yttrium
Transition metal
Familiar metals such as iron, nickel, copper and gold