• Element name: Fluorine

• Atomic number: 9

• Atomic mass number: 19

• Number of protons: 9

• Number of neutrons: 10

• Number of electrons: 9

• Number of valence electrons: 7

• Group/family number: 17

• Group/family name: Halogens

• Chemical properties/Reactivity of the element: most reactive non-metals, like to react with alkali metals

• Type of element: non-metal

• Physical properties: the color is a pale yellow

• What did it do? stole an electron from sodium (Na)

• What is the most common compound created with this element or do they exist alone in nature? Sodium Fluoride (NaF) (which fluorine stole sodium's one extra electron to make that compound)