Which of the following provided experimental evidence of the existence of the electron?
the beam in the cathode ray tube turned blue.
the alpha particle was deflected to the side.
the alpha particle was deflected straight back.
the beam of the cathode ray tube was deflected to the side.

Pbco3 –> pbo+ co2. how many liters of carbon dioxide gas is produced from the decomposition of 32 grams of lead (ll) carbonate?

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Can someone me with 3 and 4 plz. this is for masteries test.