Physical Science Chapter 5

Front 1

group

Back 1

a vertical column of elements in the
periodic table; elements in a group share
chemical properties

Front 2

period

Back 2

in chemistry, a horizontal row of
elements in the periodic table

Front 3

periodic law

Back 3

the law that states that the
repeating chemical and physical properties of
elements change periodically with the atomic
numbers of the elements

Front 4

ion

Back 4

an atom, radical, or molecule that has
gained or lost one or more electrons and has
a negative or positive charget

Front 5

metal

Back 5

an element that is shiny and that
conducts heat and electricity well

Front 6

nonmetal

Back 6

l an element that conducts heat and
electricity poorly and that does not form
positive ions in an electrolytic solution

Front 7

semiconductor

Back 7

an element or compound that
conducts electric current better than an insulator
does but not as well as a conductor does

Front 8

alkali metal

Back 8

one of the elements of Group 1 of
the periodic table (lithium, sodium, potassium,
rubidium, cesium, and francium)

Front 9

alkaline-earth metal

Back 9

one of the elements of
Group 2 of the periodic table (beryllium,
magnesium, calcium, strontium, barium,
and radium)

Front 10

halogen

Back 10

one of the elements of Group 17 of
the periodic table (fluorine, chlorine, bromine,
iodine, and astatine); halogens combine with
most metals to form salts

Front 11

noble gas

Back 11

one of the elements of Group 18
of the periodic table (helium, neon, argon,
krypton, xenon, and radon); noble gases
are unreactive

Front 12

transition metal

Back 12

one of the metals that can
use the inner shell before using the outer shell
to bond