Periodic Table

Front

What is the Periodic Table?

Back

A tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Front

What do the horizontal rows on the periodic table represent?

Back

The number of electron shells (energy levels) in the atoms of the elements.

Front

What do the vertical columns on the periodic table indicate?

Back

The number of valence electrons (electrons in the outermost shell) of the elements.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of Neutrons = Mass Number - Atomic Number.

Front

Where are the metalloids located on the periodic table?

Back

They are found along the stair-step line that divides metals and nonmetals.

Front

What is an element?

Back

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

Front

What is the atomic number of an element?

Back

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

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus of an atom.

Front

What are alkali metals?

Back

The elements in Group 1 of the periodic table, known for being highly reactive and having one valence electron.

Front

What are noble gases?

Back

The elements in Group 18 of the periodic table, known for their lack of reactivity due to having a full valence shell.