Question

j. j. thompson (late 1800s):
j. j. thompson was an english scientist. he discovered the electron when he was experimenting with gas discharge tubes. he noticed a movement in a tube. he called the movement cathode rays. the rays moved from the negative end of the tube to the positive end. he realized that the rays were made of negatively charged particles - electrons.

1. what did j.j. thompson discover?
2. what is the charge of an electron?
3. what are cathode rays made of?
4. why do electrons move from the negative end of the tube to the positive end?
5. what was thompson working with when he discovered the cathode rays?

Explanation:

1. The text clearly states "He discovered the electron".
2. It mentions "negatively charged particles - electrons".
3. "the rays were made of negatively charged particles - electrons".
4. Basic principle of charge attraction (negative to positive).
5. "experimenting with gas discharge tubes" when discovery occurred.

Answer:

1. Electrons
2. Negative charge
3. Negatively charged particles (electrons)
4. Opposite charges attract.
5. Gas discharge tubes