Q: What is a silver-colored alkaline earth metal that is even softer than calcium?


Read this paragraph and choose the correct option from the provided answers:

Strontium is a silver-colored alkaline Earth metal that is even softer than calcium. Strontium compounds are quite common and have a variety of uses—from 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.

 Choices:

- mercury

- magnesium

- lithium

- strontium


A:
strontium