5.1-5.4 Revision

Which scientist proposed the atomic theory stating that matter is made up of indivisible particles called atoms?

• Antoine Lavoisier
• John Dalton
• Dmitri Mendeleev
• Democritus

The smallest particle of matter that cannot be created or destroyed is called:

• Molecule
• Atom
• Compound
• Element

Which term describes a molecule that consists of two atoms?

• Monatomic
• Diatomic
• Polyatomic
• Isotopic

Which scientist organised atoms into a periodic table based on their properties and predicted undiscovered elements?

• Antoine Lavoisier
• John Newlands
• Dmitri Mendeleev
• Democritus

In the periodic table, a horizontal row of elements is called a:

• Group
• Period
• Series
• Family

In the periodic table, a vertical column of elements is called a:

• Row
• Group
• Period
• Set

Which of the following is monatomic?

• Oxygen (O₂)
• Helium (He)
• Nitrogen (N₂)
• Hydrogen (H₂)

Which is an example of a molecular compound?

• Helium
• Oxygen gas
• Water
• Iron

What does the term 'pure substance' mean?

• Contains only one type of substance
• A mixture of several substances
• Cannot be melted
• Is always a solid

What is the chemical symbol for oxygen?

• Ox
• O
• Oy
• Oxg