First gets brainliest

reactants : before arrow sign

: CH4 and O2

product : after arrow sign

: CO2 and H2O

the answer is the second option

When a neutral hydrogen atom loses an electron a positively charged particle should remain. A proton is a subatomic particle, symbol p+, with a positive charge of +1e elementary charge and mass slightly less than that of a neutron.
Ernest Rutherford discovered that the atom must have a concentrated positive center charge that contains most of the atom's mass. He suggested that the nucleus contained a particle with a positive charge the proton.