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28 February, 08:27

Consider these two electron configurations for neutral atoms L and M.

L - 1s22s22p63s2

M - 1s22s22p63s13p1

What is the difference between atom L and atom M?

One of the 2p electrons in L has jumped to an excited state

One of the 3p electrons in L has jumped down to a lower energy state

One of the 3s electrons in M has jumped to an excited stat

One of the 3p electrons in M has jumped down to a lower energy state

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  1. 28 February, 12:23
    0
    The 3p electron in M has jumped down to a lower energy state

    Explanation:

    L - 1s² 2s²2p⁶ 3s²

    M - 1s² 2s²2p⁶ 3s3p

    L and M have the same number of electrons, so they are atoms of the same element.

    Atom M is an excited state of atom L.

    Either atom L has been excited to atom M or atom M has dropped to the ground state to form atom L.

    A is wrong. Both atoms have two 2p electrons.

    B is wrong. Atom L has no 3p electrons.

    C is wrong. The 3s electron of atom L is already in its lowest energy state.
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