Generally how many protons it has, therefore what type of atom it is (i.e. carbon, hydrogen etc.)
phosphorus have 15 electron because you know the atomic number to know electron
Finding the number of electrons in an atom is easy. You just have to know the atomic number of the element. The atomic number for Potassium is 19. That means Potassium has 19 electrons.
A nitrogen atom has seven electrons.
Helium atom has 2 electrons.
A Mercury atom has 80 electrons.
A germanium atom has 32 electrons.
The number of electrons depends on what type of atom it is.
you see how many electrons and protons it has and add them together
The number of unpaired electrons in valence shell or numbers of electrons less then 8 in outermost shell of an atom give information about covalent bonds my be formed by an atom.
The number of protons defines what element the atom is, and it also defines how many electrons the atom has in its various orbitals in a normal state.There is one electron per proton in an atom in a normal state.
An atom of selenium has 34 electrons.
The neutral atom of potassium has 19 electrons.