What is the electron configuration for helium He ?
Answer
A
1 s to the 1th power
B
1 s squared
C
1 s squared 2 s to the 1th power
D
1 s squared 2 s squared
Explanation
Helium has 2 electrons because its atomic number is 2. The 1s orbital fills first and can hold both electrons, so helium’s electron configuration is 1s², choice B.
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