Different of an element have different numbers of electrons.

1.ions
2.isotopes
3.compounds
4.atoms

1. Ions

Explanation: Ions of an element are formed when an atom lose or gain electrons and thus different ions will have different electrons.

For example with 10 electrons is formed when Na with 11 electrons loses one electron. with 12 electrons is formed when Na with 11 electrons gains one electron.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

a sonic boom is a loud boom that breaks the sound barrier

explanation: