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Cho nguyên tư
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i cu
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a ca
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c nguyên tô
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như sau:
H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35,5
K = 39, Ca = 40, Cr = 52, Fe = 56, Cu = 64, Zn = 65, Br = 80, Ag = 108, Ba = 137.
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