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The majority of an atom's mass comes from its nucleus, where the protons and neutrons are joined. The electrons of an atom are so distant and so minuscule in size, that their weight is negligible. When calculating the mass of an atom is therefore protons+neutrons.

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Is the sum of the numbers of protons and the number neutrons in an atom is the mass number?

It is the mass number for that particular form of the atom - that particular isotope. An element can exist as more than one isotope and the atom's mass number is the (weighted) average of the mass numbers of all its isotopes.


Is the mass of an ion different from the mass of the atom it came from?

A small difference of mass exist because the gain or loss of electrons.


Is for all elements the smallest particle that can exist independently is an atom?

No, for all elements the smallest particle that can exist independently is an atom.


Which region of an atom has no mass?

Almost all of the volume of an atom has no mass.


The center of an atom where the neutrons and protons exist?

That is called the nucleus. It is positively charged and it makes up most of the atom's mass.


Which atom has atomic number zero and mass number zero?

An atom with atomic number zero and mass number zero does not exist in nature. The atomic number represents the number of protons in the nucleus, and an atom must have at least one proton to be stable.


All of the mass of an atom is due to the?

The mass of an atom is the sum of the masses of protons, neutrons and electrons.


Where is all the mass of an atom concentrated in?

The mass of an atom is concentrated in its nucleus, which is composed of protons and neutrons. The nucleus is extremely small compared to the overall size of the atom, but it contains almost all of the atom's mass. Electrons, which are much smaller in mass, orbit around the nucleus.


The mass of all particles of an atom added together is its what?

The sum of protons and neutrons in an atom is called mass number.


Where is almost all of the mass in an atom is located?

Approximately all of the atom's mass is in the nucleus. The electrons contribute almost zero.No atom has more than 100 electrons, but eachproton or neutron in the nucleushas the mass of more than 1,800 electrons.


What parts of an atom makes up all the mass of an atom?

The nucleus is the part of an atom that contains practically all its mass. In the nucleus, you can find the proton and neutron. The number of electrons, which move about the nucleus, is equal to the number of protons.


What is a nucleus of the atom contains?

Protons and neutrons. Virtually all of the atom's mass.