That depends on the element you are considering.
For a neutral atom, the number of electrons = number of protons = atomic number
There are 5 valence electrons present in the atom Nb (niobium), as it is located in group 5 of the periodic table.
There are no electrons present in a helium atom in its second energy level.
In one mole of H2, there are six electrons present. Two electrons are contributed by each hydrogen atom.
A neutral barium atom has 56 electrons. This is because the atomic number of barium is 56, which corresponds to the number of electrons it has when it is electrically neutral.
There are no unpaired electrons in an unexcited neutral mercury atom; its outer shell contains only two s electrons that are paired, as are all the electrons in the filled inner shells of the atom.
There are 3 pairs of valence electrons present on the boron atom in BF3. Boron has 3 valence electrons, and each fluorine atom provides one additional electron, giving a total of 6 valence electrons on boron.
protons and nuetrons are equal to no. of electrons present in atom
There are 17 electrons present in a chlorine atom.
electrons, neutron, protons
A potassium atom has 19 protons and 19 electrons. The number of protons always equals the number of electrons in an atom, as they balance each other to maintain the atom's overall charge neutral.
There are 19 electrons in the potassium nucleus.
Maximum of 32 electrons.