Work function of elements, in units of electron volt (eV). 0 1 Ag 4.26 – 4.74 Au 5.1 – 5.47 Be 4.98 Ca 2.87 Co 5 Cu 4.53 – 5.10 Ga 4.32 Hg 4.475 K 2.29 Lu ~3.3 Mo 4.36 – 4.95 Nd 3.2 Pb 4.25 Rb 2.261 Ru 4.71 Se 5.9 Sn 4.42 Tb 3.00 Ti 4.33 V 4.3 Yb 2.60 0 1 Al 4.06 – 4.26 B ~4.45 Bi 4.31 Cd 4.08 Cr 4.5 Eu 2.5 Gd 2.90 In 4.09 La 3.5 Mg 3.66 Na 2.36 Ni 5.04 – 5.35 Pd 5.22 – 5.6 Re 4.72 Sb 4.55 – 4.7 Si 4.60 – 4.85 Sr ~2.59 Te 4.95 Tl ~3.84 W 4.32 – 5.22 Zn 3.63 – 4.9 0 1 As 3.75 Ba 2.52 – 2.7 C ~5 Ce 2.9 Cs 2.1 Fe: 4.67 – 4.81 Hf 3.9 Ir 5.00 – 5.67 Li 2.9 Mn 4.1 Nb 3.95 – 4.87 Os 5.93 Pt 5.12 – 5.93 Rh 4.98 Sc 3.5 Sm 2.7 Ta 4.00 – 4.80 Th 3.4 U 3.63 – 3.90 Y 3.1 Zr 4.05