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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.

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Q: Why is it not necessary to include electrons when determining the mass of an atom?
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Related questions

What is key in determining whether an atom will form a bond with another atom?

Valence electrons


Why electrons are typically not included when determining the mass of an atom?

its because they are extremely small


What determines how an atom reacts?

The factor in determining how an atom reacts is the valence electrons, ie how many and in what energy level.


Determining the Electron group geometry of a central atom?

EGG=(#lone pair electrons)+(# of bond pair electrons)


Where are the valance atoms in an atom?

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.


What is the most important factor determining how an atom will bond?

the oxidation number, determined by its group on the periodic table.


What is the number of electrons in outer shell called?

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.


An element's atomic mass does not include the mass of its?

...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).


What effect does the nucleus have on atomic spectra of different elements?

Aside from determining how many electrons the atom has, the nucleus does not affect the spectra of that atom in any way.


If an atom has 10 electrons in its valence shell how will it interact with atoms of a different element?

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.


What does a sulfur atom need to do to become an ion?

It needs to lose, or gain, electrons.


What role do electrons play on determining the stability of an atom?

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!