part a\nidentify the element whose ion only exists as 2+.\nargon\nlead\ncarbon\ncalcium\nlithium
part a\nidentify the element whose ion only exists as 2+.\nargon\nlead\ncarbon\ncalcium\nlithium
Answer
Explanation:
Step1: Analyze argon
Argon is a noble - gas with a full outer electron shell. It is very stable and does not form ions easily.
Step2: Analyze lead
Lead can form ions with charges of +2 and +4 due to its position in the periodic table and its electron - configuration.
Step3: Analyze carbon
Carbon can form a variety of compounds with different oxidation states and can form ions with different charges in different chemical contexts, not just +2.
Step4: Analyze calcium
Calcium has an electron - configuration of [Ar]4s². It readily loses its two outer electrons to form a Ca²⁺ ion and typically only exists as a 2+ ion in ionic compounds.
Step5: Analyze lithium
Lithium has an electron - configuration of 1s²2s¹. It loses one electron to form a Li⁺ ion.
Answer:
calcium