Noble gas configuration → must have 8 valence electrons either by gaining or losing electrons
As → Group 5A atom → 5 valence electrons → needs 3 more electrons
As3- → -3 charge → addition of 3 electrons → 3 + 5 = 8 valence electrons → noble gas configuration
Al → Group 3A atom → 3 valence electrons → needs to lose 3 electrons
Al3+ → +3 charge → loss of 3 electrons → 3 - 3 = 0 or 8 valence electrons → noble gas configuration
Which ion does not have a noble gas configuration in its ground state?
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