Strontium metal is silver gray alkalis pieces or lumps, which tend to oxidize in air and form white powder (SrO).       Strontium (atomic symbol: Sr, atomic number: 38) is a Block S, Group 2, Period 5 element with an atomic weight of 87.62 .       Strontium Bohr ModelThe number of electrons in each of Strontium's shells is [2, 8, 18, 8, 2] and its electron configuration is [Kr] 5s2. The strontium atom has a radius of 215 pm and a Van der Waals radius of 249 pm. In its elemental form, strontium is a soft, silvery white metallic solid that quickly turns yellow when exposed to air. Its temperature raise during the whole process.  So the package should be vacuum or filled with inert gas or kerosene. it is soluble in liquid ammonia, ethyl alcohol and acids. Strontium lumps tend to compound with halogen, sulfur and selenium.  At room temperature, Sr element could compound with nitrogen that form strontium nitride(Sr3N2). Under heating condition, Sr element can compound with hydrogen that form strontium hydride(SrH2).