Make at least 3 observations that compare the Polonium nucleus before and after it decays?

Observations

Explanation:

Polonium (Po) is a radioactive silver-grey material that exists in very low concentrations as a solid in the environment.

As a radioactive substance, it is unstable and then it undergoes radioactive alpha decay to form a stable chemical element - Lead (Pb)

Polonium Nucleus before decay

Polonium (²¹⁰₈₄Po) has a mass number of 210 and an atomic number of 84. The atomic number tells us that Polonium has 84 protons in its nucleus before it undergoes decay.

The mass number tell us that Polomium has 126 neutrons in addition to the 84 protons in its nucleus

The total number of protons and neutrons in a nucleus make up its Mass Number

Polonium Nucleus  after decay

Polonium undergoes radioactive decay by emitting an alpha particle, which is also known as a Helium particle (⁴₂He)

                            ²¹⁰ ₈₄Po ⇒    ²⁰⁶ ₈₂Pb  +   ⁴₂He

Observations

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

b.

the accuracy of the data.