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Cesium - although it is liquid at room temperature, metallic bonds can be seen.

The correct option is 2. cesium.

The following information should be considered:

  • Since Cesium is in liquid at the room temperature so metallic bonds could be seen.
  • But for bromine, krypton, and sulfur, the metallic bonds can't be seen.
  • Therefore, the other options should be ignored.

Learn more: brainly.com/question/17429689