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The energies, E, for the first few states of an unknown element are shown here in arbitrary units:

n= 1, E=-21
n=2, E=-9
n=3, E=-4
n=4, E=-3
...,...
infinity, 0

A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each photon to the result of its absorption (or lack thereof) by an n=1 electron.

Photon/Energy:
A/21
B/17
C/15
D/12

Possible answers:
n=1 to n=2
n=1 to n=3
n=1 to n=4
electron ejected
not absorbed

I think the A/21 is electron ejected, but I don't know how to figure the rest...

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4 answers
  1. If I could draw a diagram but I can't. Let me try to use periods as spaces.
    E = k/N2

    .....1.....2.....3.....4.....inf
    E = -21...-9....-4....-3......0

    In going from n = 1 to n = 2 we have dE = 13
    Going from 1 to 3 we have dE = 17
    Going from 1 to 4 we have dE = 18
    Going form 1 to inf we have dE = 21
    Match them up.
    A is 21 so that must be the one ejected; i.e., ionized.
    B is 17 so that must be 1 to 3
    C and D are not absorbed.

    Check my thinking

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  2. A= ejected
    B=1->3
    C=not absorbed
    D=1->2

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  3. A= ejected
    B=1-3
    C= not absorbed
    D=1-2

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  4. Name the following compounds:

    CH3COONa

    (NH4)2SO4

    Mg(H2PO4)2

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