Which of the following elements is isoelectronic with Argon? A) Magnesium (Mg^2^), B) Calcium (Ca^2^), C) Sodium (Na^+), D) Bromine (Br^-)
Understand the Problem
The question is asking to identify which element among the options provided has the same number of electrons as Argon, making it isoelectronic. We will approach this by determining the electron configuration of each element and comparing it to Argon.
Answer
Calcium ion (Ca^2^).
The final answer is Calcium ion (Ca^2^).
Answer for screen readers
The final answer is Calcium ion (Ca^2^).
More Information
Isoelectronic species have the same number of electrons. Argon has 18 electrons, and the Calcium ion (Ca^2^) also has 18 electrons after losing two from its atomic number of 20.
Tips
A common mistake is to only look at protons, neutrons, or the atom itself without considering the electrons that are lost or gained when forming ions.
Sources
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