Chalcogen Group Quiz

What did Antoine Lavoisier prove about sulfur? 

Without ___, there wouldn't be enough oxygen in the air. 

Which one of these elements is toxic?

Why is Polonium Toxic?

What is Polonium's atomic mass?

How much selenium do we have in our bodies?

Oxygen is how much of the Earth's Atmosphere?

Who secondly discovered oxygen?

Where does Carl W. Scheele come from?

Bonus Question: In what periodic table period is Oxygen located on?