Question

who discovered electron and define isotopes​

Answer 1

During the 1880s and '90s scientists searched cathode rays for the carrier of the electrical properties in matter. Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897.

Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. Every chemical element has one or more isotopes.

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Answer 2

Answer:

J. J. Thomson discovered electron

(in chemistry) one of two or more forms of a chemical element that have different physical characteristics but the same chemical characteristics is known as isotopes