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All 3 are elements. Calcium is an alkaline earth metal; tin and aluminum are metals.
All 3 elements are solid at normal temperatures, and don't melt until they reach a high temperature (449 degrees F for tin, higher for both calcium and aluminum).
Aluminum and tin are both soft, malleable metals that resist corrosion. Tin is often used as an alloy with copper to form bronze.
Calcium is essential for living organisms. Both aluminum and tin are found in very, very small amounts in humans, but both can be toxic.
You can find out alot more information about the three elements at the link below.
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