While electrons do technically have a measurable mass, the proportion of the overall mass of the atom contributed by the electrons is negligible. The protons and neutrons in the nucleus contribute the vast majority of the mass of the atom and thus are the only parts considered.
Valence electrons
Valence electrons are the outermost electrons in an atom. They are located in the outer energy levels or orbitals, specifically in the highest principal energy level. These valence electrons are involved in chemical bonding and determining the atom's reactivity.
...electrons, as they account for a negligible mass relative to the atom as a whole (electrons make up 1/1840th of the total mass, to be precise).
The number of protons in an atom is equal to the number of electrons in the atom. Therefore, the total number of electrons in an atom can be found by determining the atom's proton number. For example, the proton number of oxygen is eight. Thus, an oxygen atom has eight protons and eight electrons.
It needs to lose, or gain, electrons.
Valence electrons
its because they are extremely small
The factor in determining how an atom reacts is the valence electrons, ie how many and in what energy level.
EGG=(#lone pair electrons)+(# of bond pair electrons)
Valence electrons are the outermost electrons in an atom. They are located in the outer energy levels or orbitals, specifically in the highest principal energy level. These valence electrons are involved in chemical bonding and determining the atom's reactivity.
the oxidation number, determined by its group on the periodic table.
The number of electrons in the outer shell are called Valence electrons and are important in determining how the atom reacts chemically with other atoms.
...electrons, as they account for a negligible mass relative to the atom as a whole (electrons make up 1/1840th of the total mass, to be precise).
Aside from determining how many electrons the atom has, the nucleus does not affect the spectra of that atom in any way.
The number of protons in an atom is equal to the number of electrons in the atom. Therefore, the total number of electrons in an atom can be found by determining the atom's proton number. For example, the proton number of oxygen is eight. Thus, an oxygen atom has eight protons and eight electrons.
It needs to lose, or gain, electrons.
The role electrons play in stabilizing an atom is they balance out the charge of the protons. If an element has more protons than electrons, it has a positive, not neutral, charge, and vice versa. Unpaired electrons can cause an element to be chemically reactive and/or radioactive. Hope this helps!