and the abundanceof 87 Rb is27.8% what is the average atomic mass of rubidium?
Thank you for the opportunity to help you with your question!
isotopes are atoms that have the same number of protons but different number of neutrons hence have different mass numbers.
to calculate the average atomic mass of an element, multiply the mass of each isotope by its natural abundance, expressed as a decimal and then add the products.
for example for the above question on rubidium, the average atomic mass is:
=(85*72.2/100) + (87*27.8/100)
NB: the average atomic mass will always be close to the element with the highest percentage abandance
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