Why is magnesium ion Mg2+?
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A magnesium atom that has lost two electrons. In the nervous system, a single magnesium ion blocks the opening of each of the cell's NMDA receptor, preventing the influx of calcium ions into the cell. ... This increase in charge is mediated by the binding of glutamate to non-NMDA receptors
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It has two electrons in it's outer shell. When these electrons are lost , a magnesium ion Mg2+ is formed .
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