Complete the sentence: during an inelastic collision, the total momentum of the system is

, while kinetic energy is .

Explanation:

A collision in which some part of a kinetic energy is changed into another form of energy is known as an inelastic collision.

In an inelastic collision momentum is conserved because total momentum of both the objects before and after the collision are same.

Whereas kinetic energy during this collision is not conserved because a part of kinetic energy changes into heat, sound and deformation of objects.

Thus, we can conclude that during an inelastic collision, the total momentum of the system is conserved, while kinetic energy is not conserved.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.