Understanding the Periodic Table - Science 14

Front

What are all things in the world made of?

Back

Incredibly tiny particles called atoms.

Front

How many different kinds of atoms are there?

Back

There are 92 different kinds of atoms.

Front

What is an element?

Back

A substance made of only one kind of atom.

Front

What does the periodic table show?

Back

A list of all elements, starting with hydrogen and ending with uranium.

Front

What is the atomic number of hydrogen?

Back

1, as it is the lightest element.

Front

What is the symbol for helium?

Back

He, with an atomic number of 2.

Front

How many horizontal rows does the periodic table have?

Back

Seven horizontal rows.

Front

What are the lanthanides and actinides?

Back

Elements 57-71 and 89-103, respectively, belonging to rows six and seven.

Front

How many elements are in the periodic table?

Back

There are 118 elements.

Front

What are groups in the periodic table?

Back

Vertical columns containing elements that are similar to each other.