This is what I've tried to work out and I'm not getting -13.7 eV. What am I doing wrong?(adsbygoogle = window.adsbygoogle || []).push({});

E 2 Π m e^4 / (4 Π ε0 )^2 h^2 6.90E-19 J=4.31eV

m 9.11 x 10-31 kg 9.11E-31

e 1.60 x 10-19 C 1.60E-19

ε0 8.85 x 10-12 C2/Nm2 8.85E-12

h 6.63 x 10-34 J S 6.63E-34

1 joule = 6.24150974 × 10^18 electron volts

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# Ground State Energy of an Electron

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