Question

dtal - ch - term 1 - unit 4a assessment - 25 - 26
due: wed oct 1, 2025 10:30am
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hester, treyvon
dtal - ch - term 1 - unit 4a assessment - 25 - 26
which of the following species have the same electron configuration as mg²⁺? select all that apply.
□ ar
□ f⁻
□ ne
□ na⁺

Explanation:

Step1: Determine Mg²⁺ electron configuration

Magnesium (Mg) has atomic number 12. Mg²⁺ has lost 2 electrons, so it has 10 electrons. Its electron - configuration is 1s²2s²2p⁶.

Step2: Analyze Ar

Argon (Ar) has atomic number 18. Its electron - configuration is 1s²2s²2p⁶3s²3p⁶, which is different from Mg²⁺.

Step3: Analyze F⁻

Fluorine (F) has atomic number 9. F⁻ has gained 1 electron, so it has 10 electrons. Its electron - configuration is 1s²2s²2p⁶.

Step4: Analyze Ne

Neon (Ne) has atomic number 10. Its electron - configuration is 1s²2s²2p⁶, same as Mg²⁺.

Step5: Analyze Na⁺

Sodium (Na) has atomic number 11. Na⁺ has lost 1 electron, so it has 10 electrons. Its electron - configuration is 1s²2s²2p⁶, same as Mg²⁺.

Answer:

C. Ne, D. Na⁺