Elements

About how many elements are there on the periodic table that occur in nature?

This is a well-known periodic table fact in chemistry circles.

(All of the other elements are strictly human-made. Some sources state more elements occur naturally because heavy elements may transition between elements as they undergo radioactive decay.)

• 94

• 102

• 81

• 121

Water (Vatten)

• H2O2

• H2O

• HO2

Oxygen (Syre)

• S

• O

• H

Approxamately how much oxygen is in the air at sea level?

• 52%

• 35%

• 21%

Salt (Salt)

• Na2Cl

• Cl2Na

• NaCl

Carbon monoxide (Kolmonoxid)

• CO

• CO2

• C2O

Arsenic (Arsenik)

• Ac

• Ar

• As

Iron (Järn)

• Ie

• Fe

• Be

What is Pb

• Cobalt (Kobolt)

• Lead (Bly)

• Tin (Tenn)

What is Sn

• Tin (Tenn)

• Silver (Silver)

• Zinc (Zink)