The atomic mass of potassium is 39.098 atomic mass units. Potassium Properties: Potassium's melting point is 63.25°C, boiling point is 760°C, specific gravity is 0.862 (20°C), with a valence of 1. Isotope abundances of potassium. It provides atomic mass, mass excess, nuclear binding energy, nucleon separation energies, Q-values, and nucleon residual interaction parameters for atomic nuclei of the isotope K-63 (Potassium, atomic number Z = 19, mass number A = 63). The decay of 40 K to 40 Ar is used in potassium-argon dating of rocks. 41 K. 40.9618254 (12) 6.7302 (44) 3 / 2. What is Potassium on the Periodic Table? Please visit the Potassium element page for information specific to the chemical element of the periodic table. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. More... Potassium-39 atom is the stable isotope of potassium with relative atomic mass 38.963707, 93.3 atom percent natural abundance and nuclear spin 3/2. 0.8; Density; 0.86 g.cm -3 at 0 °C; Melting point; 63.2 °C Natural potassium is composed of three isotopes, including potassium-40 (0.0118%), a radioactive isotope with a half life of 1.28 x 10 9 years. Atomic weight (average mass of the atom): 39.0983 Potassium-39 is normally about 13.5 times more plentiful than potassium-41. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Atomic number (number of protons in the nucleus): 19; Atomic symbol (on the Periodic Table of Elements): K (from the Latin word for alkali, kalium.) In 1975, the Commission recommended Ar (K) = 39.0983 (3), based on new mass-spectrometric measurements and results of a mineralogical study of possible isotopic variations. 4. 0.2148699. Isotope data for potassium-37 in the Periodic Table Isotopes of Potassium (click to see decay chain): 32 K 33 K 34 K 35 K 36 K 37 K 38 K 39 K 40 K 41 K 42 K 43 K 44 K … Potassium is the first element of the fourth period (row) in the periodic table. In a human body of 70 kg mass, about 4,400 nuclei of 40 K decay per second. Element Potassium (K), Group 1, Atomic Number 19, s-block, Mass 39.098. The result of low Potassium Periodic Table levels is evident in numerous symptoms like restricted growth, reduced flowering, lower yields, and lower quality products. The disintegration of potassium-40 is used in geological age calculations (see potassium-argon dating). The natural radioactivity of potassium is due to beta radiation from the potassium-40 isotope (10 9 years half-life). Atomic Mass of Potassium Atomic mass of Potassium is 39.0983 u. 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