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8 January, 23:37

Which electron configurations represent the first two elements in Group 17 (7A) of the Periodic Table?

A

1s22s1 and 1s22s2

B

1s22s22p6 and [Ne]3s23p5

C

1s22s22p5 and [Ne]3s23p5

D

1s22s2 and 1s22s22p1

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Answers (2)
  1. 8 January, 23:45
    0
    Option C is correct

    1s22s22p5 and [Ne]3s23p5

    Explanation:

    Step 1: Data given

    Group 17 = the halogens

    Halogens have 7 valence electrons

    The first element of group 17 = Fluorine (F)

    Fluorine has 9 electrons

    The electron configuration is

    1s2 2s2 2p5

    The second element of group 17 = Chlorine (Cl)

    Chlorine has 17 electrons

    The electron configuration is

    1s2 2s2 2p6 3s2 3p5

    Option C is correct

    1s22s22p5 and [Ne]3s23p5
  2. 8 January, 23:57
    0
    Answer:a
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