5.1 and 5.2

Question 1

describes something that occurs or repeats at regular intervals

Answer 1

periodic

Question 2

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

Answer 2

periodic law

Question 3

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

Answer 3

period

Question 4

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

Answer 4

group

Question 5

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

Answer 5

alkali metal

Question 6

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

Answer 6

alkaline-earth metal

Question 7

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

Answer 7

halogen

Question 8

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

Answer 8

noble gas