Three. In fact, any element in the same column of the periodic table as nitrogen will also gain three electrons when forming an ion.
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Nitrogen has to gain three electrons
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.
It will lose 2 to form Sr2+
nitrogen should give 5 electrons (or better gain 3 electrons) to attain noble gas configuration.
This is a chemical element. You can find the how many electron in a single atom by using a periodic table.
Nitrogen has to gain three electrons
Nitrogen will have two valence electrons forming a triagonal pyramid structure.
When forming compounds, nitrogen can obtain up to three electrons from other atoms.
Nitrogen has to gain three electrons
Nitrogen has 5 electron in it's outer shell, so it would need to gain 3 electrons to have a full valence shell
Selenium will gain two electrons and arsenic will gain three electrons
In phosphene it gain 4 electrons. Phosphate lose 4 electrons
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nitrogen has 5 valence electrons. It should gain 3 electrons to achieve a noble gas configuration.
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Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.