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mol H2 = 6,72/ 22,4 = 0,3
mol L = 2/3 x 0,3 = 0,1
Mr L = 10,4/ 0,1 = 104
Elektron = 104 - 28 = 76
konfigurasi elektron terakhir:
6s^2 4f^14 5d^6
periode = 6
Golongan = 2 + 6 = 8B