Writing Chemical Formulas

An atom _________ independently

• always exists

• does not exist

• may or may not exist

What is the atomicity of noble gases?

• 3

• 4

• 1

• 2

What is the valency of nitrate?

• -1

• -2

• -3

• -4

What is the molecular formula of fluorine?

• Fl

• Fl2

• F

• F2

What is the formula of sodium carbonate?

• Na₂CO₃

• Na₃CO₂

• NaCO₃

• NaCO₂

Write the molecular formula of ammonium sulphate

• NH₄SO ₄

• (NH₄) ₂SO₃

• (NH₄)₂SO₄

• (NH₃)₂SO₄

What is the formula of cuprous sulphide?

• CuS2

• Cu2SO3

• Cu2S

• CuS

The valency of mercury is:

• 1

• 1 and 2

• 2

• 2 and 3

Write the molecular formula of silver oxide.

• Ag₂O

• AgO

• Ag₂O₂

• Ag₃O

Write the molecular formula of ozone.