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31.Hall - Heroult itu proses pembuatan Aluminium. Sedangkan Down itu proses pembuatan Magnesium. Jadi yang benar adalah Jawaban E.
32.
₉₄Th²³⁵ + ₀γ⁰ ➝ ₅₆Ba¹³⁹ + ₃₆Kr⁹⁴ + x ₁e⁰
Hukum Kekekalan Nomor atom :
94 + 0 = 56 + 36 + x
94 = 92 + x
x = 2 [B]