Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Strontium is a silver-colored alkaline Earth metal that is even softer than calcium. Strontium compounds are quite common and have a variety of usesfrom fireworks to cement to toothpaste. In fireworks, strontium compounds produce deep red explosions. In toothpaste, like the one pictured in the Figure below , the compound strontium chloride reduces tooth sensitivity. Answer: strontium
A:
What is a silver-colored alkaline earth metal that is even softer than calcium?