👉 Strontion, also known as beryllium strontium, is a chemical element with the symbol Sr and atomic number 80. It is the lightest of all the naturally occurring isotopes of calcium. Strontium has two isotopic forms, strontium-90 and strontium-137. The latter is used in nuclear medicine to diagnose various diseases and disorders by measuring the activity of radioisotopes within the patient's body.
