All the representative elements (group a. in a group on the periodic table have the same number of

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as