1.A hydrogen atom has an excited electron in the n = 6 energy level. This electr

Question

1.A hydrogen atom has an excited electron in the n = 6 energy level. This electron then emits a photon as it moves down to a lower energy level. Given that the energy emitted from the electron has a value of -1.82 x 10-19 J, what energy level did the electron relax to?

1

2

3

4

2.How many possible values can exist for the quantum number ml at n = 3?

3

2

6

5

3.The location of an electron was determined experimentally. Which of the following measurements could NOT be taken next?

Momentum

Charge

Mass

Atomic radius

Explanation / Answer

E = -R*(1/nf^2 -1/ni^2)

E = -2.178*10^-18*(1/nf^2 -1/6^2)

E = -1.82*10^-19

Then

0.0835 = (1/nf^2 -1/6^2)

0.0835 = 1/nf^2 - 0.02778

nf^2 = (0.0835 +0.02778)^-1

nf = 8.9863^0.5

nf = 2.99 or 3

2)

For n = 3 then

l = n1 = 2

l = 0,1,2

then ml = 0, +/- 1; ´+/-2 = 5 in total

3)

if you locate the electron, then the momentum cant be calculated

charge, mass are inherent properties of an electron

atomic radius is a probability distribution funciton

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