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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

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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.

$2.19