Which element belongs to the alkali metal family

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.

What information does a complete ionic equation give that the balanced equation doesn’t show?