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The electron configuration of hydrogen is written as:
A2p1
B1s1
C1s2
D2s1
Answer & Solution
Correct answer: B. 1s1
1. Hydrogen has one electron, so only one spot is occupied.
2. That electron goes into the 1s orbital, the closest to the nucleus.
3. This is designated as 1s1, where the superscripted 1 refers to the one electron within the 1s orbital.
4. Helium has two electrons and therefore completely fills the 1s orbital, giving 1s2.
5. Nothing enters the second shell until the first is full.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 2 'The Chemical Foundation of Life', sections 2.1-2.3_
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