Please help... chemistry... not fun... ?

Question

18. A local radio station can be tuned in by dialing your radio to a frequency of 101.5 MHz. Calculate the energy of the wave.

a. 6.73 x 10-32 J

b. 6.53 x 10-42 J

c. 6.73 x 10-26 J

d. 6.73 x 10-29 J

19. Write the electronic configuration according to the general rules given in the objective for Gd (#64).

a. [Xe]6s24f75d1

b. [Xe]4f75d16s2

c. [Rn]6s24f8

d. [Xe]6s24f8

21. How many unpaired electrons are there for Cr (#24)?

a. 6

b. 4

c. 2

d. 1

Answer 1

18) c. 6.73 x 10-26 J

101.5 MHz x 10^6 Hz/1 MHz x 6.63x10^-34 J*s=6.73x10^-26 J

19) b. [Xe]4f7 5d1 6s2

21) [Ar]3d5 4s1

a. 6