write the electron configuration for the first excited state of He^+   Determine the member of each of the following pair of atoms that has the larger radius (only using periodic table) a) O and F       b) Kr and Xe c) F and Cl      d) Mg and Ca

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Chapter3: Atoms And Elements
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write the electron configuration for the first excited state of He^+

 

Determine the member of each of the following pair of atoms that has the larger radius (only using periodic table)

a) O and F       b) Kr and Xe

c) F and Cl      d) Mg and Ca

Expert Solution
Step 1

He has 2 electrons

its electronic configuration is 1s2

but in an excited state, its configuration is 1s1 2s1

so, when it loses an electron and become He+

it will have only 1 electron left.

so, its excited state electronic configuration is 1s1.

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