How many protons z and how many neutrons n are there in a nucleus of the most common isotope of rubidium, 8537rb?

Stage in which a typical star has completely stopped fusion

What produces wave a)sound b) heats c)transfer of energy d)vibrations

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.