Electron Configuration Crossword Puzzle

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QUESTIONS LIST:

arsenic : [ar]4s2 3d10 4p3
potassium : 1s2 2s2 2p6 3s2 3p6 4s1
lithium : 1s2 2s1
boron : 1s2 2s2 2p1
silicon : [ne]3s2 3p2
calcium : [ar]4s2
uranium : challenge level: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f3
sulfur : [ne]3s2 3p4
fluorine : 1s2 2s2 2p5
magnesium : 1s2 2s2 2p6 3s2
aluminum : [ne]3s2 3p1
neon : 1s2 2s2 2p6
carbon : 1s2 2s2 2p2
nitrogen : 1s2 2s2 2p3
lead : [xe]6s2 4f14 5d10 6p2
gallium : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
hydrogen : 1s1
oxygen : 1s2 2s2 2p4
helium : 1s2
iron : 1s2 2s2 2p6 3s2 3p6 4s2 3d6
chlorine : 1s2 2s2 2p6 3s2 3p5
sodium : [ne]3s1
argon : [ne]3s2 3p6
beryllium : 1s2 2s2
phosphorus : 1s2 2s2 2p6 3s2 3p3