Humans have used rocks in the creation of tools and building materials true or flase

True, if you would like an example look at Indian arrow heads or early architecture all use rocks.

Ifound this on google “these two compounds have a different ionic structure. caesium ion is larger in size when compared to the sodium ion. the charge gets more area to spread out evenly. so caesium chloride has a lower melting point than sodium chloride.” i hope this you for what your looking for

The answer is c. 320 g