How many electons are present in aluminium atom and in aluminium ion

Dear student, 
Al3+ ion is formed when Al loses 3 electrons.

Atomic number of Al is 13.
number of electrons in Al = atomit no. 
Thus no. of electrons in 1atom of Al = 13
In Al3+ ,number of electrons =atomic number - 3 = 13-3 =10 
Regards
 

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