tperiodique = dict(Ac=227.0278, Al=26.98154, Am=243.0614, Sb=121.75, Ag=107.8682,
                   Ar=39.948, As=74.92159, At=209.9871, N=14.00674, Ba=137.327,
                   Bk=247.0703, Be=9.01218, Bi=208.98037, Bh=262.1229, B=10.811,
                   Br=79.904, Cd=112.411, Cs=132.90543, Ca=40.078, Cf=251.0796,
                   C=12.011, Ce=140.115, Cl=35.4527, Cr=51.9961, Co=58.9332, Cn=277.,
                   Cu=63.546, Cm=247.0703, Ds=269., Db=262.1138, Dy=162.5, Es=252.0829,
                   Er=167.26, Sn=118.71, Eu=151.965, Fe=55.847, Fm=257.0951, F=18.9984,
                   Fr=223.0197, Gd=157.25, Ga=69.723, Ge=72.61, Hf=178.49, Hs=265.,
                   He=4.0026, Ho=164.93032, H=1.00794, In=114.82, I=126.90447, Ir=192.22,
                   Kr=83.8, La=138.9055, Lr=260.1053, Li=6.941, Lu=174.967, Mg=24.305,
                   Mn=54.93805, Mt=266., Md=258.0986, Hg=200.59, Mo=95.94, Nd=144.24,
                   Ne=20.1797, Np=237.0482, Ni=58.69, Nb=92.90638, No=259.1009, Au=196.96654,
                   Os=190.2, O=15.9994, Pd=106.42, P=30.97376, Pt=195.08, Pb=207.2, Pu=244.0642,
                   Po=208.9824, K=39.0983, Pr=140.90765, Pm=146.9151, Pa=231.0359, Ra=226.0254,
                   Rn=222.0176, Re=186.207, Rh=102.9055, Rg=272., Rb=85.4678, Ru=101.07, Rf=261.1087,
                   Sm=150.36, Sc=44.95591, Sg=263.1182, Se=78.96, Si=28.0855, Na=22.98977, S=32.066,
                   Sr=87.62, Ta=180.9479, Tc=98.9063, Te=127.6, Tb=158.92534, Tl=204.3833, Th=232.0381,
                   Tm=168.93421, Ti=47.88, W=183.85, Uuh=238.0289, Uuo=50.9415, Uup=131.29, Uuq=173.04,
                   Uus=88.90585, Uut=65.39, U=91.224)