![]() Therefore, then mark those three remaining electrons pairs oxygen atom.Therefore, we cannot mark those two electrons There are already two electrons in the last shell of hydrogen atom. Hydrogen atom cannot keep more than two electron in its last shell. Usually, those remaining electron pairs should be started to mark on outside atoms (not first on center atom).īut in OH -, there are only two atoms.There are only one bond in the above drawn sketch.Now, we have to mark lone pairs on atoms. So, deciding the sketch of OH - ion was simple. Total valence electrons = 1 + 6 + 1 = 8.Valence electrons received due to -1 charge = 1.valence electrons given by sulfur atom = 6*1 = 6.valence electrons given by hydrogen atoms = 1 * 1 = 1.Valence shells of hydrogen and oxygen atom. Now we know how many electrons are includes in Oxygen is a group VIAĮlement in the periodic table and contains six electrons in its last shell. ![]() HydrogenĮlectron in its last shell (valence shell). ![]() There are only two elements in OH - ion hydrogen and oxygen. Total number of electrons of the valance shells of OH - ion
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