Ch.5 Periodic Table

Question 1

Periodic

Answer 1

appearing or occurring at intervals.

Question 2

Periodic Law

Answer 2

a law in chemistry: the elements when arranged in the order of their atomic numbers show a periodic variation of atomic structure and of most of their properties.

Question 3

Period

Answer 3

a length or portion of time.

Question 4

Group

Answer 4

put together or place in a group or groups.

Question 5

Alkali Netals

Answer 5

any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.

Question 6

Alkaline-Earth Metals

Answer 6

any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table. They are reactive, electropositive, divalent metals, and form basic oxides that react with water to form comparatively insoluble hydroxides.

Question 7

Halogens

Answer 7

any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen, from which simple salts can be made.

Question 8

Noble Gases

Answer 8

any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known.