H - 1, He - 2, Li - 3, Be - 4, B - 5, C - 6, N - 7, O - 8, F - 9, Ne - 10, Na - 11, Mg - 12, Al - 13, Si - 14, P - 15, S - 16, Cl - 17, Ar - 18, K - 19, Ca - 20,

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