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2007-12-31 18:19:54 · 3 answers · asked by tony 1 in Science & Mathematics ➔ Chemistry
The ground state electron configuration for He is 1s2 because He has 2 electrons, any s sublevel contains two electrons (anti-parallel in spin according to the Pauli exclusion principle), and the 1s sublevel must be filled before electrons can be placed in sublevels of higher potential energy (aufbau principle and diagonal rule) when constructing a ground state electron configuration.
2007-12-31 22:19:03 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Helium (He) has 2 electrons.
Because it has 2 electrons, these electrons will fill the 1s orbital, making it complete. While occupying the 1s orbital, the electrons will have opposite spins.
2007-12-31 18:25:21 · answer #2 · answered by ¿ /\/ 馬 ? 7 · 0⤊ 2⤋
Because it has 2 electrons. A full shell for 1s orbital.
2007-12-31 18:24:53 · answer #3 · answered by mcalhoun333 4 · 0⤊ 0⤋