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In 1931, German chemist and physicist Erich Hückel proposed a theory to help determine if a planar ring molecule would have aromatic properties. His rule states that if a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic.
In the uranium series, 4n + 2 represents the decay process of uranium-238 (238U) where it undergoes alpha decay to form thorium-234 (234Th) by emitting an alpha particle. The equation indicates that for every 1 decay of uranium-238, 1 thorium-234 and 2 alpha particles are produced.
Take north to be the positive direction, and south to be the negative direction. Net force = 13N + (-17N) = -4N Net force = 4N to the south.
There is no such element: an element is neutral, so it has equal numbers of protons and electrons.Impossible:2 protons 4 neutrons and 3 electrons is the IMpossible He-1 isotope with mass number 6 (=2p+4n). Helium does not accept electrons because it is noble.Possible:2 protons 4 neutrons and 2 electrons is (elemental) Helium, isotope with mass number 6 (=2p+4n)3 protons 4 neutrons and 3 electrons is (elemental) Lithium
If you think to 4 moles of methane the number is 24,088563428.10e+23.