What element has the same electron configuration as 1s 2 2s 2 2p 6 3s 2 3p 6 ?
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Answer

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Step 1
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Step 2
: Identify the Electron Configuration

The given electron configuration is $$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}

Final Answer

Argon (Ar), atomic number 18, has the electron configuration 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}.