Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of Rb is 27.8%, what is the average atomic mass of rubidum? You must round your answer to two decimal places.

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

Why does his teacher ask him to balance the equation by including the correct coefficient