H LI Na Mg Rb Be Cs Ca Sr Ba Fr Ra Sc TI 91 Zr Hf Rf Co Nb Mo Ta Cr Mn M Db Sg Pr W TC Fe Co NI Ru Re Os 8050 Bh Hs Rh Pd Pt THE Mt Ds 24 3 31.34 RO 5 80 Cd Hp Cr PD TD Nd Pm Sm Eu Go TI At Chromium by 51.996 Lu In the example above chromium), what does the number 24 indicate? This number tells you the atomic mass of the element O This number tells you the number of protons and neutrons (combined) in the nucleus O This number tells you the number of protons this element possesses O This number reflects the fact that this was the 24th element discovered This number indicates how many isotopes are possible