19. The element neon (Ne), which is used in signs, differs from both fluorine (F) and sodium
(Na) by one proton each. Sodium, an alkali metal, and fluorine, a halogen, are both
extremely reactive. In contrast, neon, which is a noble gas, is highly unreactive. Use the
information contained on a periodic table to explain the difference in their chemical
properties.
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19. The element neon (Ne), which is used in signs, differs from both fluorine (F) and sodium
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