Which of the following does not show the law of conservation of mass?

a. 24 g of mg burn in 32 g o2 to produce 56 g of mgo.

b. 24 ml of mg burn in 32 ml o2 to produce 56 ml of mgo.

c. 2 atoms of mg react with 1 molecule of o2 to produce 2 units of mgo.

d. 1 atom of mg reacts with 1 atom of o to produce a unit of mgo that contains 2 atoms.

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons