Question
Which metal is most likely to form more than one kind of positively charged ion?
sodium (Na)
barium (Ba)
nickel (Ni)
magnesium (Mg)
sodium (Na)
barium (Ba)
nickel (Ni)
magnesium (Mg)
Answers
GPT-5 mini
Nickel (Ni).
Reason: Nickel is a transition metal and commonly exhibits multiple oxidation states (e.g., Ni2+, Ni3+, sometimes Ni+), whereas sodium, barium, and magnesium (main-group metals) typically form a single stable positive ion (Na+; Ba2+; Mg2+).
Reason: Nickel is a transition metal and commonly exhibits multiple oxidation states (e.g., Ni2+, Ni3+, sometimes Ni+), whereas sodium, barium, and magnesium (main-group metals) typically form a single stable positive ion (Na+; Ba2+; Mg2+).