Front

What are periods on the periodic table?

Back

Horizontal rows that indicate the energy levels of the elements.

Front

How are elements arranged on the periodic table?

Back

In increasing order of atomic number.

Front

What is a semiconductor?

Back

A substance that has properties of both metals and nonmetals, typically a metalloid.

Front

Where are nonmetals located on the Periodic Table?

Back

On the right side of the table.

Front

Which element is a metalloid?

Back

Arsenic (As, #33) is a metalloid.

Front

What are groups on the periodic table?

Back

Vertical columns that group elements with similar chemical properties.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What are alkali metals?

Back

The elements in Group 1 of the periodic table, known for being highly reactive.

Front

What are noble gases?

Back

The elements in Group 18 that are inert and do not readily form compounds.

Front

What is the significance of the stair-step line on the periodic table?

Back

It separates metals from nonmetals and indicates the location of metalloids.