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Niels Bohr improved Rutherford’s atomic model, identifying protons and neutrons in the nucleus. An atom with 17 protons has 17 electrons. Fluorine has 9 protons and 10 neutrons. The first periodic table was made by Mendeleev, featuring periods and groups. Argon's electron configuration is 1s2 2s2 2p6. Carbon has 4 valence electrons and forms covalent bonds, while ionic bonds arise from electron transfer between metals (cations) and nonmetals (anions). Methane is a common natural gas.