Basic Information Name: Barium Symbol: Ba Atomic Number: 56 Atomic Mass: 137.327 amu Melting Point: 725.0 °C (998.15 K, 1337.0 °F) Boiling Point: 1140.0 °C (1413.15 K, 2084.0 °F) Number of Protons/Electrons: 56 Number of Neutrons: 81 Classification: Alkaline Earth Crystal Structure: Cubic Density @ 293 K: 3.51 g/cm3 Color: Silver
Atomic Structure Number of Energy Levels: 6 First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 18 Fourth Energy Level: 18 Fifth Energy Level: 8 Sixth Energy Level: 2 IsotopesIsotopeHalf LifeBa-130StableBa-13111.7 daysBa-132StableBa-13310.5 yearsBa-133m1.6 daysBa-134StableBa-135StableBa-135m1.2 daysBa-136StableBa-137StableBa-137m2.6 minutesBa-138StableBa-1391.4 hoursBa-14012.8 daysBa-14118.3 minutesBa-14210.7 minutes Facts Date of Discovery: 1808 Discoverer: Sir Humphrey Davy Name Origin: From the Greek word barys (heavy) Uses: Medical applications, among others Obtained From: barytine, whiterite
