Can helium pair up to become a compound? (ex: sodium and chlorine=sodium chloride)

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

What type of matter is made of only one kind of atom

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate