Antimony

Atomic Mass is 121 & Atomic Number is 51
===Protons=51, Neutrons=70, and Electrons=51 A Proton is a sub-atomic particle found in the nucleus of all conventional atoms. An Electron, is also s sub-atomic particle carrying negative charge, it orbits an atoms nucleus. A Neutron is a tiny sub-atomic particle with all forms of conventional matter.===

Physical Characteristic: It has this Silvery Lustrous Gray color.
===Chemical Characteristic: Antimony does not combine with Oxygen in the air at room temperature. It also doesn't react with cold water or with most cold acids. It does dissolve in some hot acids, however, and in aqua regia.===