MediumChemistryHigh School (9–10)GeneralStructure of the Atom › Electronic Configuration and ValencyConceptualNumerical
The calcium ion, Ca²⁺, and the chloride ion, Cl⁻, each have the same electron arrangement as a…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The calcium ion, , and the chloride ion, , each have the same electron arrangement as a noble gas. Find the arrangement of each ion, and name the noble gas. Use : and : .
Need a reminder? The key ideaShow
The valence electrons are those in the outermost shell. With to of them, the valency is that number; with to , it is minus the number. A full outer shell gives a valency of . Atoms lose, gain or share electrons to reach a full outer shell, like a noble gas.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Calcium. The atom is . It loses its outer electrons: is .
Step 2. Chlorine. The atom is . It gains electron: is .
Step 3. The noble gas. is argon.
Answer: both are , the arrangement of argon.
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