electron configuration

What is the electron configuration for As. [Ar]

When I looked on the periodic table, it didn't make sense because [Ar] comes before As.

asked by M.
  1. 3.) Predict ground-state electron configuration. Write in abbreviated form using noble gas in brackets.

    a.) Cr^2+
    b.) Cu^2+
    c.) Co63+

    posted by M.
  2. What is your problem in doing this? What do you not understand?

    posted by DrBob222

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