Question

The first four energy level in arbitrary units of energy of an unknown element are listed...

The first four energy level in arbitrary units of energy of an unknown element are listed below:
n 1 2 3 4 ... infinity
E -20 -9 -4 -3 ... 0

A gaseous sample of the element is bombarded by photons with energies in these units of 20, 16, 15, 11, 9, and 1. Which of these photons could potentially be absorbed by an electron in the n=1 state of the element? In each case, indicate the transition that would occur.

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