What is the relative mass of an electron?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the relative mass of an electron?

Explanation:
The relative mass of an electron is about 1/1836 of the mass of a proton. In numbers, the electron’s mass is roughly 9.11×10^-31 kg while a proton is about 1.67×10^-27 kg, giving a ratio of about 5.4×10^-4, i.e., 1/1836. So the electron is much lighter than a proton, which is why in chemistry the atom’s mass is mostly due to the protons and neutrons in the nucleus rather than the electrons. The other options would imply the electron is as heavy as a proton or massless, which isn’t correct.

The relative mass of an electron is about 1/1836 of the mass of a proton. In numbers, the electron’s mass is roughly 9.11×10^-31 kg while a proton is about 1.67×10^-27 kg, giving a ratio of about 5.4×10^-4, i.e., 1/1836. So the electron is much lighter than a proton, which is why in chemistry the atom’s mass is mostly due to the protons and neutrons in the nucleus rather than the electrons. The other options would imply the electron is as heavy as a proton or massless, which isn’t correct.

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