Correct answer only ! potential energy can be converted into kinetic energy and

True. Energy regularly goes from one type of energy to another. For example if you were holding a book up a certain distance in the air it would have a certain potential energy. If you were to drop the book it would gain kinetic energy as it is now moving through space with some velocity v.

true because when the potential energy is converted to the kinetic, that means that anything tat goes up must come back down or the other way around

An atom is constructed of three different particles known as electrons, protons and neutrons.

These particles have different mass and charges and are responsible for various characters than an atom posses.

An electron has a negative charge, a proton has positive charge and charge of neutron is neutral. Equal number of electrons and protons are present in an atom that make it electrically neutral but different conditions can occur if we remove these particles from an atom.

1 : Model of an ionized atom - an ionized atom is one which has some net charge on this. It can be either a positive charge or a negative charge.

If we need to sketch the model of an ionized atom then one should either keep the number of electrons less or proton.

2: Model of radioactive atom : A radioactive atom is one an unstable atom and has access of energy in its center. It can be caused by adding either neutrons or protons.