Can somebody help me, please!

Rubidium-85=61.2

Rubidium-87=24.36

Atomic Mass=85.56 amu

Explanation:

To find the atomic mass, we must multiply the masses of the isotope by the percent abundance, then add.

Rubidium-85

This isotope has an abundance of 72%.

Convert 72% to a decimal. Divide by 100 or move the decimal two places to the left.

Multiply the mass of the isotope, which is 85, by the abundance as a decimal.

Rubidium-85=61.2

Rubidium-87

This isotope has an abundance of 28%.

Convert 28% to a decimal. Divide by 100 or move the decimal two places to the left.

Multiply the mass of the isotope, which is 87, by the abundance as a decimal.

Rubidium-87=24.36

Atomic Mass of Rubidium:

Add the two numbers together.

i'm assuming that it's c.) red bank..

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