4. which hypothesis led to the discovery of the proton?
a. cathode rays should be attracted to a positively-charged plate.
b. the nucleus of an atom should contain neutrons.
c. when a neutral hydrogen atom loses an electron, a positively-charged
particle should remain.
d. a proton should be 1840 times heavier than an electron.

Option C.When a neutral hydrogen atom loses an electron, a positively-charged .

Result: Losing of an electron by hydrogen lefts a positive charge i.e proton.

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.