[{"from": "human", "value": "What can you tell me about this molecule? [Hf]"}, {"from": "gpt", "value": "The molecule is a grayish metallic colored powder. Dust from dry powder may be ignited by static electricity. The dry powder reacts with moisture to produce hydrogen, a flammable gas. The heat from this reaction may be sufficient to ignite the hydrogen. It does not appreciably react with large quantities of water."}]