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19 December, 06:29

Consider these elements: p, ca, si, s, ga.

a. write the electron configuration for each element

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Answers (1)
  1. 19 December, 09:31
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    Method:

    1) Find the atomic number in a periodic table: the number of electrons equal the atomic number

    2) Use Aufbau rule

    Element atomic number electron configuration

    P 15 1s2 2s2 2p6 3s2 3p3

    Ca 20 1s2 2s2 2p6 3s2 3p6 4s2

    Si 14 1s2 2s2 2p6 3s2 3p2

    S 16 1s2 2s2 2p6 3s2 3p4

    Ga 31. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p
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