The number of protons is same as like that of atomic number of the atom in an element. The protons of the element carry positive charge and the electrons carry negative charge.
The number of electrons in an atom is equal to the number of protons. The element can be defined as a substance that have the same number protons.
Elements are chemically the simplest substance which cannot be further broken down using any of the chemical reactions.
That is because being prokaryotic or eukaryotic doesn't depend on the size of the organism, but rather on the cellular structure. Both are eukaryotic because they have clearly defined nuclei and functioning organelles that are differentiated, unlike prokaryotic organisms.
