Understanding the Periodic Table and Elements

What is an element?

• A substance made of only one kind of atom

• A mixture of atoms

• A type of molecule

• A compound

How many different kinds of atoms are there?

• 92

• 118

• 100

• 75

What does the periodic table list?

• Chemical reactions

• Mixtures

• Compounds

• Elements from lightest to heaviest

What is the atomic number of hydrogen?

• 1

• 10

• 3

• 2

Which element is represented by the symbol 'He'?

• Holmium

• Helium

• Hydrogen

• Hafnium

How many horizontal rows are in the periodic table?

• 7

• 10

• 5

• 8

What are the lanthanides and actinides?

• Laboratory tools

• Types of compounds

• Special groups of elements

• Chemical processes

What is the atomic number of calcium?

• 20

• 22

• 12

• 15

Which group do the alkali metals belong to?

• Group 17

• Group 2

• Group 1

• Group 18

What property do metals have?

• They are brittle

• They are malleable

• They are insulators

• They are gases