The electronic configuration of H⁻ is:
Correct answer: C. 1s²
- A. 1s⁰
- B. 1s¹
- C. 1s²
- D. 1s²,2s¹
Explanation
The hydride ion H minus is a hydrogen atom that has gained one electron, so it has two electrons filling the 1s orbital, 1s2, the same configuration as helium. 1s1 is neutral hydrogen and 1s0 is the proton H plus.
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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