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Question 18

Gallium is an element in Group 3 of the Periodic Table.

A sample of gallium contains two isotopes, 3169Ga^{69}_{31}\text{Ga}3169​Ga and 3171Ga^{71}_{31}\text{Ga}3171​Ga.

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 gallium atom?

  • A: 3
  • B: 13
  • C: 31
  • D: 69
[1]
d.

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

  • 3169Ga^{69}_{31}\text{Ga}3169​Ga: 60.1%
  • 3171Ga^{71}_{31}\text{Ga}3171​Ga: 39.9%

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

[3]

Atomic structure Questions

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