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Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Answer from each drop-down menu. e characteristics of a borane molecule (bh). the lewis structure and table of electronegativities are given olecular shape is and the molecule is reset next erved. search e a

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from