Chemistry brain teaser?

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Verctor

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The following are electron configurations of some elements. For each element: 1) identify the element by symbol; 2) indicate what period the element is in; and 3) indicate what group the element is in.
a. 1s22s22p5
b. [Ne]3s23p3
c. [Ar]4s23d6
d. [Kr]5s24d105p1
e. [He]2s22p3
 
a. F; 2nd period; Halogens (Group 17)

b. P; 3rd period; Group 15

c. Fe; 4th period; Group 8

d. In; 5th period; Group 13

e. N; 2nd period; Group 15
 
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