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I have look and read and I still cant figure the couple out can someone please help? Number of orbital’s in the 2p subshell? And Number of electrons in 3d subshell? Number of electrons in a 3p orbital? Subshell block begins to fill after 4s2? Number of valence electrons in As?

  • Chem -

    Just remember 1s 2p 3d 4f
    There is/are 1 s orbital, 3 p orbitals, 5 d orbitals, and 7 f orbitals. Since each orbital can hold two electrons there are 2s, 6p, 10d and 14f electrons. For As, go to and scroll to electron configuration.

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