Periodic Table Introduction

Front

What is the Atomic Number?

Back

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

Front

What is the Atomic Mass?

Back

The Atomic Mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What does the term 'periodic' mean in the context of the periodic table?

Back

The term 'periodic' refers to a regular, repeating pattern of properties among the elements.

Front

What are metals?

Back

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

Front

What are nonmetals?

Back

Nonmetals are elements that are generally poor conductors of heat and electricity and have more varied properties than metals.

Front

What are metalloids?

Back

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

Front

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

Back

The stair-step line separates metals from nonmetals and indicates the location of metalloids.

Front

What is the difference between atomic number and atomic mass?

Back

The atomic number is the number of protons, while the atomic mass is the average mass of an element's isotopes.

Front

What is the atomic mass of Carbon?

Back

The atomic mass of Carbon is approximately 12.01 amu.

Front

What is the atomic number of Hydrogen?

Back

The atomic number of Hydrogen is 1.