atomic number 55, n.
a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
<noun.substance>
Cs atomic number 55 caesium cesium
Word
a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
<noun.substance>
Cs atomic number 55 caesium cesium