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Atomic structure

Atomic structure

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Question 16
a.

The table below shows the relative mass and relative charge of protons, neutrons, and electrons. Some values are missing.

Subatomic particleRelative massRelative charge
Neutron[ P ][ Q ]
Electron[ R ]-1
Proton1[ S ]

State the values of [ P ], [ Q ], [ R ], and [ S ].

[4]
b.

The chemical symbol for an atom of one isotope of boron is 511B{}_5^{11}\text{B}511​B.

State the number of protons, neutrons, and electrons present in one neutral atom of this isotope.

[3]
c.

What is meant by the term isotopes?

[2]
d.

Rubidium has two naturally-occurring isotopes with mass numbers 85 and 87. A sample of rubidium contained the two isotopes in the following proportions:

  • rubidium-85 = 72.2%72.2\%72.2%
  • rubidium-87 = 27.8%27.8\%27.8%

Use this information to calculate the relative atomic mass of rubidium. Give your answer to two decimal places.

[3]
Markscheme

Atomic structure Questions

  1. IGCSE
  2. /Chemistry
  3. /Atomic structure

41 exam-style questions on Edexcel IGCSE Chemistry Atomic structure. Each one has a worked solution and a mark scheme showing where the marks go.

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