Depending on the conditions, manganese (Mn) can exhibit different crystal structures. Under certain conditions, a sample of Mn crystallizes in a cubic crystal lattice with a density of 6.345 g/cm3 and a cell edge length of 386.0 pm. What is the crystal structure of Mn under these conditions

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The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na