Sample Exercise 2.1 Illustrating the Size of an Atom

The number of protons (22) is the atomic number of the element. By referring to a periodic table or list of elements, we see that the element with atomic number 22 is titanium (Ti). The mass number of this isotope of titanium is 22 + 26 = 48 (the sum of the protons and neutrons). Because the ion has three more ................
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