Vocabulary

Front 1

Group/Family

Back 1

any grouping of languages, whether it is made on the basis of geography, genetic relationship, or something else.

Front 2

Period

Back 2

a rather large interval of time that is meaningful in the life of a person, in history, etc., because of its particular characteristics.

Front 3

Metal

Back 3

any of a class of elementary substances, as gold, silver, or copper, all of which are crystalline when solid and many of which are characterized by opacity, ductility, conductivity, and a unique luster when freshly fractured.

Front 4

Non-metal

Back 4

an element not having the character of a metal, as carbon or nitrogen.

Front 5

Metalloid

Back 5

a nonmetal that in combination with a metal forms an alloy.

Front 6

Alkali Metals

Back 6

any of the group of univalent metals including potassium, sodium, lithium, rubidium, cesium, and francium, whose hydroxides are alkalis.

Front 7

Alkaline Earth Metals

Back 7

any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals.

Front 8

Periodic Table

Back 8

a table illustrating the periodic system, in which the chemical elements, formerly arranged in the order of their atomic weights and now according to their atomic numbers, are shown in related groups.

Front 9

Periodic Law

Back 9

the law that the properties of the elements are periodic functions of their atomic numbers.

Front 10

Henry Moseley

Back 10

English physicist: pioneer in x-ray spectroscopy.

Front 11

Halogens

Back 11

any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.

Front 12

Noble Gases

Back 12

any of the chemically inert gaseous elements of group 8A or 0 of the periodic table: helium, neon, argon, krypton, xenon, and radon.

Front 13

Dmitri mendeleev

Back 13

Russian chemist: helped develop the periodic law.

Front 14

Valence Electrons

Back 14

an electron of an atom, located in the outermost shell (valence shell) of the atom, that can be transferred to or shared with another atom.