Front

What are the three broad classes of elements?

Back

Metals, nonmetals, and metalloids.

Front

What are the elements colored blue on the periodic table?

Back

Nonmetals.

Front

Why did Mendeleev leave spaces in the periodic table he developed?

Back

He knew more elements would be discovered.

Front

What are the columns on the periodic table known as?

Back

Groups.

Front

Which element is located in group 3, period 2?

Back

Boron.

Front

What is the definition of a metal?

Back

Metals are elements that are typically shiny, good conductors of heat and electricity, and malleable.

Front

What is the definition of a nonmetal?

Back

Nonmetals are elements that are generally poor conductors of heat and electricity and can be gases or brittle solids.

Front

What is a metalloid?

Back

Metalloids are elements that have properties of both metals and nonmetals.

Front

What is the significance of the periodic law?

Back

The periodic law states that the properties of elements are a periodic function of their atomic numbers.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.