Metal

• How Is Nickel Extracted From Its Ores?
  Nickel extraction depends on the ore: sulfides are commonly concentrated and smelted, while laterites are smelted or leached and refined.
• Why Do Alkaline Earth Metals Usually Melt at Higher Temperatures?
  Alkaline earth metals usually melt hotter than neighboring alkali metals, but band filling alone cannot explain the trend or predict melting points.