Problem: Which ion does not have a noble gas configuration in its ground state? a) As3- b) Al3+ c) Ga3+ d) Sc3+

FREE Expert Solution

Noble gas configuration → must have 8 valence electrons either by gaining or losing electrons

a) As3-

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


b) Al3+

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

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Problem Details

Which ion does not have a noble gas configuration in its ground state? 

a) As3- 

b) Al3+ 

c) Ga3+ 

d) Sc3+

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