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Question 6

Rubidium is an element in Group 1 of the Periodic Table.

A sample of rubidium contains two isotopes, 3785Rb^{85}_{37}\text{Rb}3785​Rb and 3787Rb^{87}_{37}\text{Rb}3787​Rb.

a.

State how the nuclei of the two isotopes are similar.

[1]
b.

State how the nuclei of the two isotopes are different.

[1]
c.

How many electrons are in the outer shell of a rubidium atom?

  • A: 1
  • B: 37
  • C: 48
  • D: 85
[1]
d.

The relative abundances of the two isotopes in the sample of rubidium are:

  • 3785Rb^{85}_{37}\text{Rb}3785​Rb: 72.2%72.2\%72.2%
  • 3787Rb^{87}_{37}\text{Rb}3787​Rb: 27.8%27.8\%27.8%

Calculate the relative atomic mass of rubidium. Give your answer to one decimal place.

[3]

Atomic structure Questions

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