Atomic Structure of Hydrogen

• Hydrogen has one proton and zero neutrons in its most common isotope. There are two additional isotopes of hydrogen--deuterium with one neutron and tritium with two neutrons.
  
  

Physical Properties of Hydrogen

• Hydrogen is a non-metal with a melting point of -259.24 degrees Celsius and a boiling point of -252.87 degrees Celsius.
  
  

Importance of Hydrogen

• Hydrogen is a principal component of the Sun and Jupiter. Very little atmospheric hydrogen exists on Earth but is found in a large number of compounds including water and organic molecules.
  
  

Atomic Structure of Sulfur

• Sulfur has 16 protons and 16 neutrons in its most common isotope.
  
  

Physical Properties of Sulfur

• Sulfur is a non-metal with a melting point of 119.6 degrees Celsius and a boiling point of 444.6 degrees Celsius.
  
  

Importance of Sulfur

• Sulfur is an ingredient in gunpowder and essential in the production of sulfuric acid, an extremely important industrial and chemical compound. Sulfur is incorporated into a number of amino acids and the compound hydrogen sulfide is easily recognized by its rotten egg smell.