Topic 1 Answers

(12.00 x 9.93) + (13.00 x 1.07) 100 Both isotopes contain 6 protons but different numbers of neutrons. Or: An isotope with a mass of 12.00 contains 6 protons and 6 neutrons, while the isotope with a mass of 13.00 contains 6 Na Mg 1s22s22p63s2 Al 1s22s22p63s23p1 Si 1s22s22p63s23p2 P 1s22s22p63s23p3 S Ar 1s22s22p63s23p6 1 1 4 2 59. 4 62. 2 65. 2 ................
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