Scientists found rock deep in the earth and determined it was three billion years old. this rock is most likely which type of rock?

How many atoms of oxygen are contained in 160 grams of n2o3

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

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