1s2
2s2
2p6
3s2
3p6
3d10
4s2
4p6
4d10
4f14
5s2
5p6
5d10
5f14
6s2
6p6
6d10
6f14
7s2
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The orbital diagram for radium (Ra) would show 88 electrons distributed among the energy levels and orbitals according to the aufbau principle and Hund's rule. Radium has 88 protons, so it has an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10 6p^6 7s^2.
Two electrons in the outer shell of radium.
An orbital diagram is used to show how the orbitals of a subshell areoccupied by electrons. The two spin projections are given by arrowspointing up (ms =+1/2) and down (ms = -1/2). Thus, electronicconfiguration 1s22s22p1 corresponds to the orbital diagram:
The orbital diagram for chromium with atomic number 24 would show two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbital, six electrons in the 3s orbital, two electrons in the 3p orbital, and four electrons in the 3d orbital. This configuration would follow the aufbau principle and Hund's rule.
The full orbital diagram of S (sulfur) includes 2 electrons in the 1s orbital, 2 electrons in the 2s orbital, and 4 electrons in the 2p orbitals (2 in each p orbital). The electron configuration of sulfur is 1s2 2s2 2p4.
The electron configuration of helium is 1s2.