Cracking the SAT Chemistry Subject Test

Question Type C

24. The electron configuration 1s^22 s^22 p^63 s^23 p^64 s^23 d^7 represents an
    atom of the element
    (A) Br
    (B) Co
    (C) Cd
    (D) Ga
    (E) Mg


25. The electron configuration for an atom of the element Tc is
    (A) 1s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^10 4 s^2 4 p^5 5 s^2 5 p^6
    (B) 1s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^10 4 s^2 4 p^3 5 s^2 4 d^5
    (C) 1s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^10 4 s^2 4 p^3
    (D) 1s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^15
    (E) 1s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^10 4 s^2 4 p^6 5 s^2 4 d^5


26. A neutral species whose electron configuration is
    1 s^22 s^22 p^63 s^23 p^63 d^104 s^24 p^65 s^24 d^105 p^6 is
    (A) highly reactive
    (B) a positively charged ion