Name: Fluorine Symbol: F Atomic Number: 9 Atomic Mass: 18.998404 amu Number of Protons/Electrons: 9 Number of Neutrons: 10 Date of Discovery: 1886 Discoverer: Joseph Henri Moissan Uses: Refrigerants Classification: Halogen
Bromine
Name: Bromine Symbol: Br Atomic Number: 35 Atomic Mass: 79.904 amu Number of Protons/Electrons: 35 Number of Neutrons: 45 Date of Discovery: 1826 Discoverer: Antoine J. Balard Uses: Poisonous Classification: Halogen
Astantine
Name: Astatine Symbol: At Atomic Number: 85 Atomic Mass: (210.0) amu Number of Protons/Electrons: 85 Number of Neutrons: 125 Date of Discovery: 1940 Discoverer: D.R. Corson Uses: No uses known Classification: Halogen
Chlorine
Name: Chlorine Symbol: Cl Atomic Number: 17 Atomic Mass: 35.4527 amu Number of Protons/Electrons: 17 Number of Neutrons: 18 Date of Discovery: 1774 Discoverer: Carl Wilhelm Scheele Uses: Water purification, bleaches Classification: Halogen
Iodine
Name: Iodine Symbol: I Atomic Number: 53 Atomic Mass: 126.90447 amu Number of Protons/Electrons: 53 Number of Neutrons: 74 Date of Discovery: 1811 Discoverer: Bernard
Courtois Uses: required in humans Classification: Halogen