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which electron listed below would have the lowest energy? expalin your answer • a 1s electron...

which electron listed below would have the lowest energy? expalin your answer

• a 1s electron in H
• a 2s electron in Li
• a 1s electron in Li
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Answer #1

Energy expression is , En = -13.6 (z2/n2 ) eV

From the expression we can see that as the atomic number increases (z) , the value of energy will decrease and as principal quantum number (n) increases the value of energy will increase.

For having lowest energy ,z value should high and n value should low.

So the correct answer is 1s electron in Li

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