Science true or false

State whether the following statement is true or false:
Radioactive isotope of iodine is used for making the medicine called tincture iodine.

State whether the following statements are true or false:
The cathode rays obtained from all the gases consist of negatively charged particles called electrons.

State whether the following statements are true or false:
Thomson proposed that the nucleus of an atom contains protons and neutrons.

State whether the following statements are true or false:
The anode rays obtained from all the gases consist of positively charged particles called protons.