7th Ch.5 Sec.1-2

Question 1

periodic

Answer 1

describes something that occurs or repeats at regular intervals

Question 2

periodic law

Answer 2

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

Question 3

period

Answer 3

in chemistry, a horizontal row of elements in the periodic table; elements in a group share chemical properties

Question 4

alkali metal

Answer 4

one of the elements of group 1 of the periodic table (berylium, magnesium, calcium, strontium, barium, and radium)

Question 5

halogen

Answer 5

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

Question 6

noble gas

Answer 6

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