Which pair has 1 electron in it's 's' orbital?
Correct answer: B. Na & Cr
- A. Li & Fe
- B. Na & Cr
- C. K & Mn
- D. H & He
Explanation
Na electron configuration is 1s2 2s2 2p6 3s1. Cr electron configuration is [Ar] 3d⁵ 4s¹.
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About Atomic Structure
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
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