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Question 2.1: Writing Nuclide Symbols What is the nuclide symbol for a nuc...

Writing Nuclide Symbols

What is the nuclide symbol for a nucleus that contains 38 protons and 50 neutrons?

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From the Table of Atomic Numbers and Atomic Weights on the inside back cover of this book, you will note that the element with atomic number 38 (the number of protons in the nucleus) is strontium, symbol Sr. The mass number is 38 + 50 = 88. The symbol is  ^{88}_{38} Sr.

the Table of Atomic Numbers and Atomic Weights

Name Symbol  Atomic number Atomic weight Name Symbol Atomic number Atomic weight
Actinium Ac 89 (227) Mercury Hg 80 200.59
Aluminum Al 13 26.981538 Molybdenum Mo 42 95.94
Americium Am 95 (243) Neodymium Nd 60 144.24
Antimony Sb 51 121.76 Neon Ne 10 20.1797
Argon Ar 18 39.948 Neptunium Np 93 (237)
Arsenic As 33 74.9216 Nickel Ni 28 58.6934
Astatine At 85 (210) Niobium Nb 41 92.90638
Barium Ba 56 137.327 Nitrogen N 7 14.0067
Berkelium Bk 97 (247) Nobelium No 102 (259)
Beryllium Be 4 9.012182 Osmium Os 76 190.23
Bismuth Bi 83 208.98038 Oxygen O 8 15.9994
Bohrium Bh 107 (264) Palladium Pd 46 106.42
Boron B 5 10.811 Phosphorus P 15 30.973761
Bromine Br 35 79.904 Platinum Pt 78 195.078
Cadmium Cd 48 112.411 Plutonium Pu 94 (244)
Calcium Ca 20 40.078 Polonium Po 84 (209)
Californium Cf 98 (251) Potassium K 19 39.0983
Carbon C 6 12.0107 Praseodymium Pr 59 140.90765
Cerium Ce 58 140.116 Promethium Pm 61 (145)
Cesium Cs 55 132.90545 Protactinium Pa 91 231.03588
Chlorine Cl 17 35.453 Radium Ra 88 (226)
Chromium Cr 24 51.9961 Radon Rn 86 (222)
Cobalt Co 27 58.9332 Rhenium Re 75 186.207
Copper Cu 29 63.546 Rhodium Rh 45 102.9055
Curium Cm 96 (247) Rubidium Rb 37 85.4678
Darmstadtium Ds 110 (281) Ruthenium Ru 44 101.07
Dubnium Db 105 (262) Rutherfordium Rf 104 (261)
Dysprosium Dy 66 162.5 Samarium Sm 62 150.36
Einsteinium Es 99 (252) Scandium Sc 21 44.95591
Erbium Er 68 167.259 Seaborgium Sg 106 (266)
Europium Eu 63 151.964 Selenium Se 34 78.96
Fermium Fm 100 (257) Silicon Si 14 28.0855
Fluorine F 9 18.9984032 Silver Ag 47 107.8682
Francium Fr 87 (223) Sodium Na 11 22.98977
Gadolinium Gd 64 157.25 Strontium Sr 38 87.62
Gallium Ga 31 69.723 Sulfur S 16 32.065
Germanium Ge 32 72.64 Tantalum Ta 73 180.9479
Gold Au 79 196.96655 Technetium Tc 43 (98)
Hafnium Hf 72 178.49 Tellurium Te 52 127.6
Hassium Hs 108 (277) Terbium Tb 65 158.92534
Helium He 2 4.002602 Thallium Tl 81 204.3833
Holmium Ho 67 164.93032 Thorium Th 90 232.0381
Hydrogen H 1 1.00794 Thulium Tm 69 168.93421
Indium In 49 114.818 Tin Sn 50 118.71
Iodine I 53 126.90447 Titanium Ti 22 47.867
Iridium Ir 77 192.217 Tungsten W 74 183.84
Iron Fe 26 55.845 Ununbium Uub 112 (285)
Krypton Kr 36 83.798 Ununhexium Uuh 116 (292)
Lanthanum La 57 138.9055 Ununquadium Uuq 114 (289)
Lawrencium Lr 103 (262) Unununium Uuu 111 (272)
Lead Pb 82 207.2 Uranium U 92 238.02891
Lithium Li 3 6.941 Vanadium V 23 50.9415
Lutetium Lu 71 174.967 Xenon Xe 54 131.293
Magnesium Mg 12 24.305 Ytterbium Yb 70 173.04
Manganese Mn 25 54.938049 Yttrium Y 39 88.90585
Meitnerium Mt 109 (268) Zinc Zn 30 65.409
Mendelevium Md 101 (258) Zirconium Zr 40 91.224
A value in parentheses is the mass number of the isotope of longest half-life. Atomic weights in this table are from the IUPAC report “Atomic Weights of the Elements 2001,” Pure and Applied Chemistry, Vol. 73, (2001), pp. 667–683, with changes reported in Chem. Int. Vol. 23 (2001), p. 179.

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