(b) Draw a simple cubic unit cell. Calculate the packing efficiency of a simple cubic unit cell. (5%)

25. The compound cisplatin, Pt(NH₃)₂Cl₂, has been studied extensively as an antitumor agent. The reaction for the synthesis of cisplatin is: K₂PtCl₄(aq) + 2 NH₃(aq) → Pt(NH₃)₂Cl₂(s) + 2 KCl(aq) Write the electron configuration for platinum ion in cisplatin. Most d⁸ transition metal ions exhibit square planar geometry. Draw the structure of cisplatin and give chemical names for cisplatin based on either Stock system or Ewing-Bassett system. (6%)

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(b) Draw a simple cubic unit cell. Calculate the packing efficiency of a simple cubic unit cell. (5%)

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