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6.1 Atomic structure and isotopes

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Question 15

A laboratory sample contains ions of an element represented by X\mathrm{X}X. Each ion was formed when a neutral atom of the element lost one outer electron. Each ion contains 18 electrons, and its nucleus contains 20 neutrons.

Which nuclear symbol represents the neutral atom before it lost the electron?

[1]
A

1920X{}^{20}_{19}\mathrm{X}1920​X

B

1939X{}^{39}_{19}\mathrm{X}1939​X

C

1820X{}^{20}_{18}\mathrm{X}1820​X

D

1839X{}^{39}_{18}\mathrm{X}1839​X

Markscheme

6.1 Atomic structure and isotopes Questions

  1. GCSE
  2. /Physics
  3. /6.1 Atomic structure and isotopes

103 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.

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