Periodic Table of the Elements

Front

What determines an element's identity?

Back

The number of protons.

Front

What are the horizontal rows on the periodic table called?

Back

Periods.

Front

Which element is highly reactive?

Back

Sodium.

Front

Which elements have the most similar chemical properties?

Back

Potassium (K) and Sodium (Na).

Front

What does the number at the bottom of each square in the periodic table represent?

Back

Atomic mass.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What are groups in the periodic table?

Back

Vertical columns that contain elements with similar chemical properties.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties.

Front

What is a chemical symbol?

Back

A one or two-letter abbreviation for an element.

Front

What are noble gases?

Back

Elements in Group 18 that are mostly unreactive due to having a full valence shell.