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Which atom has the same number of electrons as a Ca²⁺ ion? A. Ar B. K C. Ti D. Ca

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Answer:

Ar

Step-by-step explanation:

A neutral calcium atom would have the same number o electrons as protons. Ca has an atomic number of 20, which means it has 20 protons. A neutral Ca atom would also have 20 electrons. This one, Ca²⁺, is missing 2 electrons, which is why is has a +2 charge. That means it only has 18 electrons. A neutral element having 18 electrons also has 18 protons. Element 18 is Argon (Ar).

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