1s2 2s2 2p6 3s2 3p6 3d8 4s2
Electronic equipment:
One of the diagrams representing the extranuclear electronic structure of atoms. There are seven electron layers. The electron layers such as K, L, M, N, O, P, Q are represented by 1, 2, 3, 4, 5, 6, 7, and the electron sublayers are represented by symbols such as S, P, D, F, and the number of electrons on each sublayer is represented by the numbers in the upper right corner of these symbols. For example, the electronic arrangement of oxygen atoms is1s22s24p4. So far, only seven electron layers have been found!
Electron arrangement refers to the state of electrons moving outside the nucleus with the symbol of energy level and the numerical value of electrons contained in energy level.
For atoms in a stable state, the extranuclear electrons will be arranged according to the principle of the lowest energy as far as possible. In addition, because electrons can't all be crowded together, we should also abide by Pauli exclusion principle and Hunter's law. Generally speaking, under the guidance of these three rules, the extranuclear electronic configuration of element atoms can be deduced, and the first 36 elements required by middle school are no exception.
In electronic configuration, the internal electronic configuration can be represented by the corresponding rare gas element symbols with square brackets to simplify the electronic configuration. The part with the symbol of rare gas elements in square brackets is called "atomic reality". For example, the electronic configuration of carbon, sodium and calcium atoms are1s22p2, 1 s22p 63s 1, and their simplified electronic configuration can be expressed as [he] 2s2p2 and [Ne]3s 1.
Atomic reality -[he]: 1s2, [ne]:1s22sp6, [ar]: 1s 22 p 63s 23 p 6, [kr]:1s22p63s23p63d/kloc-.
[Xe]: 1 S2 2s 2 2p 6 3s 2 3p 6 3d 10 4 S2 4p 6 4d 10 5s 2 5p 6 、[ Rn]: 1 S2 2s 2 2p 6 3s 2 3p 6 3d 1 0 4 S2 4p 6 4d 10 4f 14 5s 2 5p 6 5d 10 6s 2 6p 6 、[ Uuo]:654438
Related knowledge is introduced in detail:
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