Chapter 5

Question 1

Periodic Table

Answer 1

An arrangement of elements in columns, based on a set of properties that repeat from row to row.

Question 2

Period

Answer 2

A row in a periodic table of elements.

Question 3

Group

Answer 3

A column of elements in a periodic table.

Question 4

Periodic Law

Answer 4

The pattern of repeating properties displayed by elements in the periodic table.

Question 5

Atomic Mass Unit

Answer 5

One twelth the mass of a carbon-12 atom.

Question 6

Metals

Answer 6

Elements that are good conductors of heat and electric current.

Question 7

Transition Metals

Answer 7

Elements that form a bridge between elements on the left and right sides of the periodic table.

Question 8

Nonmetals

Answer 8

Elements that are poor conductors of heat and electric current.

Question 9

Metalloids

Answer 9

Elements with properties that fall between those of metals and nonmetals.

Question 10

Valence Electron

Answer 10

An electron that is in the highest occupied energy level of an atom.

Question 11

Alkali Metals

Answer 11

The elements in Group 1A of the periodic table, not including hydrogen.

Question 12

Alkaline Earth Metals

Answer 12

The elements in Group 2A of the periodic table.

Question 13

Halogens

Answer 13

The elements in Group 7A of the periodic table.

Question 14

Noble Gases

Answer 14

The elements in group 8A of the periodic table.