Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
The correct answer to this question is option D. A study area to the information in your study unit, the location that has to be the highest illuminance is the study room because it is the place the students can stay to study.
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i believe the answer is...
Atoms of isotopes of an element have different numbers of protons.
