Each part of this question asks you about your knowledge of the hydrogen atom sp

Question

Each part of this question asks you about your knowledge of the hydrogen atom spectrum.

Eatom = -2.178 x10-18 J * (1/nf2 - 1/ni2)

Part 1:

Choose the electron transition that has the largest energy.

A) n = 4 n= 1

B) n = 3 n= 2

C) n = 4 n= 3

D) n = 4 n= 2

E) n = 3 n= 1

F) n = 2 n= 1

Part 2:

Choose the electron transition that will emit the photon with the longest wavelength.

A) n = 3 n= 2

B) n = 4 n= 3

C) n = 4 n= 1

D) n = 4 n= 2

E) n = 3 n= 1

F) n = 2 n= 1

Part 3:

Choose the electron transition that produces light in the visible portion of the electromagnetic spectrum.

A) n = 3 n= 1

B) n = 4 n= 2

C) n = 2 n= 1

D) n = 4 n= 1

E) n = 4 n= 3

Explanation / Answer

E = R*(1/nf^2 – 1/ni ^2)

R = -2.178*10^-18 J

Nf = final stage/level

Ni = initial stage/level

E = Energy per unit (i.e. J/photon)

larges energy depends therefore on

(1/nf^2 – 1/ni ^2)

then

highest level shown --> 4, therefore, we must hav ehte LOWEST level as well,

verify 4 to 1

, it exist, therefore this has the most energy

Q2

longest wavlength --> least energy

E = hc/WL

largest energy depends therefore on the leas tvalue of:

(1/nf^2 – 1/ni ^2)

choose = 4, then to n = 3

only 1 drop of level, of the highest level will be very low energy

Q3

light visible is from 400 nm to 700 nm

this corresponds to BALMER series, i.e. n = 2 at the end

from the list

4--> 2 aqua color

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