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₁₇Y = 2,8,7 (Gol VII A)
X ⇒ X²⁺ + 2e⁻
2Y + 2e⁻ ⇒ 2Y⁻
X²⁺ + 2Y⁻ ⇒ XY₂
maka senyawa yang terbentuk XY₂