130 120 110 100 90 80 70 60 50 • Stable 40 Radioactive 30 20 10 10 20 30 40 50 60 70 80 90 100 Number of protons (2) Consider the plot of stable and radioactive nuclei. For nuclei of low atomic number (20 or less), which of the following describes the relative number of protons and neutrons in the nuclei that exist? they are about equal there are more protons than neutrons there are more neutrons than protons Number of neutrons (N)

Q: %Lysis COMP 250 COMP 100 COMP 20 n=1 87.77 81.73 65.8 n=2 81.71 50.45 63.7 n=3 86.64 55.38 59.4 n=4…

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.