Elements 1 to 50 with symbols no. Of electrons and no. Of neutron
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hydrogen 1
helium 2
lithium 3
berylium 4
boron 5
carbon 6
nitrogen 7
oxygen 8
fluorine 9
neon 10
sodium 11
magnesium 12
aluminium 13
silicon 15
phosphurus 16
chlorine 17
argon 18
potassium 19
calcium 20
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