By: Hayden Kerr 4th Block


Discovery: 1808 and was discovered by Sir Humphry Davy

3 properties: Chemical: reacts violently with water and gives off hydrogen gas, Physical: Melting point 63 C, and Density: 0.89

Uses: Fertilizers, salt substitute, and to produce other chemicals.

3 compounds: Potassium chloride (fertilizer), Potassium hydroxide (soap/detergents), and Potassium carbonate (KHCO3)


Number of Valence electrons: 8

Periodic Table

  • Atomic number/mass: 19 and 39.098
  • Neutrons: 20 Protons: 19 Electrons: 19
  • Nuclide: 39K, 40K
  • Hyphen: K-39,


  1. All have one valence electrons
  2. Low melting points and boiling points
  3. Very soft, you can cut it with a knife
  4. Low densities
  5. React quickly with water

Reaction Type

Reaction Type: Synthesis

Equation: K + H2O --> H2 + 2KOH

Mole Ratio: 1 mol of K and 1 mol of H2O makes 2 KOH

Potassium in Water (reaction only)


2 K (s) + 2 H2O (l) → 2 KOH (aq) + H2(g): Potassium Hydroxide

Its an ionic bond

K: 51% H2O: 49%

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