Valence electrons of first 20 elements
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Hydrogen-1
helium-2
lithium-1
beryllium-2
boron-3
carbon-4
nitrogen-5
oxygen-6
fluroine-7
neon-8
sodium-1
magnesium-2
aluminium-3
silicon-4
phosphorus-5
sulphur-6
chlorine-7
argon-8
potassium-1
calcium-2
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