The element is chromium.
What is the element whose ion has 21 electrons and has a +3 charge?
Metallic elements lose electrons to form positively-charged ions.
A metal that has lost an electron will have a +1 charge
Similarly, a metal that has lost two electrons will have a +2 charge.
A metal that has lost three electrons will have a +1 charge.
Thus, the neutral metallic element will have 21 + 3 electrons = 24 electrons
The atomic number of the element is 24.
The element that has atomic number 24 is chromium.
Therefore, the element is chromium.
In conclusion, metals lose electrons to form positively-charged ions.
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