Science-Periodic Tables
Terms
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- periodic law
- the law that states that the repeating cheimcal and physical properties of elements change periodically with the atomic numbers of the elements
- alkaline-earth metals
- one of the elemtents of group 2 of the periodic table
- noble gas
- one of the elements of group 18 of the periodic table that are unreactive
- periodic
- describes something that repeats or occurs at regular intervals
- nonmetal
- an element that conducts heat and electricity poorly, nonmalleable, nonductile
- transition metals
- shiny, good conductors of heat and electricity
- halogen
- one of the elements of group 17 of the periodic table; combine with most metals to form salts
- alkali metals
- one of the elements of group 1 of the period table
- group
- a verticle column of elements in the periodic table; elements in a group share chemical properties
- metal
- an element that is shiny and that conducts heat and electricity well
- metals
- shiny, malleable, ductile, good conductor of heat and electricity
- Mendeleev
- descovered a pattern of the periodic elements by arranging them according to their atomic mass
- Mosley
- aranged elements by atomic number
- valence electron
- an electron that is found on the outermost shell of an atom and determines the atom's chemical properties
- period
- in chemistry, a horizontal row of elements on the periodic table
- metalloids
- have properties of both metals and nonmetals; shiny, brittle, hard, good conductor of electric current