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Protons and neutrons are the primary contributors to an atom's mass. Electrons make up an insignificant amount of mass. Atomic mass is determined by adding the number of protons and neutrons in a nucleus.

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Related Questions

What thing makes up matter?

Mass and atoms


What is mass proportional to the number that makes up an object?

atoms


What makes up of the atoms?

The nucleus makes up most of the mass and the other things in the atom make up the rest.


How many atoms of the element makes up molar mass?

The molar mass is the sum of the atomic weights of atoms contained in the molecule.


What makes up nearly all of the atoms's mass?

The sum of all Protons and Neutrons.


The nucleus makes up 99 percent of the atoms what?

The nucleus makes up nearly all of the mass of an atom, with over 99% of its mass concentrated in the nucleus. Within the nucleus, most of the mass is found in the protons and neutrons, while the electrons surrounding the nucleus contribute very little to the overall mass.


How can Atoms vary?

Atoms and elements can vary in many ways. Atoms mainly vary by having different numbers of protons, electrons, and neutrons. The count of protons makes up an elements mass number.


From which atoms does oxygen can be made?

Oxygen is made up of It is replenished by plants and other photosynthetic organisms. Oxygen also makes up most of Earth's oceans by mass. A water molecule (H2O) is made up of two hydrogen atoms and one oxygen atom. Although there are more hydrogen atoms in water, hydrogen has less mass.


What is the unit that makes up matter?

atoms


What is atoms mass most made up off?

mass of protons + mass of neutrons


What makes up the mass in a chemical reaction?

In a chemical reaction, the mass is made up of the reactants and products involved in the reaction. According to the law of conservation of mass, mass is neither created nor destroyed during a chemical reaction, but is instead rearranged to form new substances.


Does a molecule have mass?

Yes. For example water molecules (2 hydrogen connected to 1 oxygen atom) have a bent shape.