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Chemistry Solutions

1) An FM station broadcasts at 106.9 MHz, calculate the wavelength of the corresponding radio waves.

2) What is the amount of energy packaged in a photon with a wavelength of 310 nm ?

3) Calculate the frequency of EM radiation with a wavelength of 1.2 x 10-7 m

4) Write the full electronic configuration for

Sr

He

Zn

Br

5) For each of the following elements indicate which set of orbitals is being filled last (# of sublevel & s,p,d,f)

W

Fe

Na

6) How many valence electrons are in:

Mg C Br Cs

7) How many electrons can fit in a "d" subshell ?

8) How many orientations are there for "f" subshells ?

9) In each of the following sets of elements indicate which element has the largest atomic size

Li, Rb, Cs B, Ga, Tl F, Cl, I

10) Which element in each set has the lowest ionization energy ( 6pts)

Li, K, Cs

Li, C, F

F, Cl, I

11) Write the valence configuration only for Al

12) Which "block" are following elements in - s,p,d,f

Te Cs

Nd Mo

Au Br

13) Which element has the highest electronegativity?

Ga Br As

Solution Preview

Please see the attached Solution.

1) An FM station broadcasts at 106.9 MHz, calculate the wavelength of the corresponding radio waves.
c = f* λ
3.0 x 10^8 m/s = 106.9 x 10^6 Hz * λ
λ=wavelength= = 3.0 x 10^8 m/s divided by 106.9 x 10^6 Hz
λ = 2.806 meters.

2) What is the amount of energy packaged in a photon with a wavelength of 310 nm ?
E = hf = hc/λ = (6.63 x 10^(-34) Js * 3.0 x 10^8 m/s ) / (310 x 10^-9 m)
= 6.416 x 10^(-19) J

3) Calculate the frequency of EM radiation with a wavelength of 1.2 x 10-7 m
c = f* ...

Solution Summary

The FM station for boardcasts are calculated. The amount of energy packaged in a photon with a wavelength is given.

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