15 points
in the picture of the atom above, what subatomic particle does the letter a represent?
question 1 options:
proton
neutron
electron

Electron

Explanation:

See attached figure (it was missing in the question).

An atom consists of three types of particle:

- Proton: it is positively charged (charge ) and it is located in the nucleus. Its mass is approximately

- Neutron: it has no electric charge, and it is also located in the nucleus. Its mass is just slighly larger than that of the proton (but it is also approximated to )

- Electron: it is negatively charged (charge ) and it orbits around the nucleus. Its mass is much smaller than that of the proton ()

From the figure, we see that the only particle orbiting around the nucleus is particle A: therefore, A must be an electron.

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