Periodic Table

Front

Vertical columns on the periodic table are called ___?

Back

groups or families

Front

Horizontal rows on the periodic table are called ___?

Back

periods

Front

The periodic table is mostly comprised of what type of element?

Back

Metals

Front

Mendeleev first ordered the periodic table of elements by increasing ___?

Back

atomic mass

Front

Which color on the image of the periodic table corresponds with the halogens?

Back

red

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What are metalloids?

Back

Elements that have properties of both metals and nonmetals.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their properties and atomic structure.

Front

What are noble gases?

Back

Elements in group 18 that are colorless, odorless, and inert.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances.