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Which particles account for most of the atoms mass?
Physics has not managed to discover a particle that accounts for mass
What makes up the mass of atoms?
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.
What is negligible mass?
mass that is so tiny
what element has 21 protons 21 electrons and 24 neutrons?
chromium
Where is most of the mass of an atom contained?
When calculating the mass of an atom, you add the mass of the protons and the neutrons. This is the nucleus of the atom. The electrons are small enough to be ignored except in the most delicate calculations.
Why is mass number calculated with only the protons and neutrons and not electrons?
Because the mass of electron is negligible when compared to the mass of protons or neutrons.
What is this element atomic mass?
mass of protons + mass of neutrons present in the element (as the mass of electrons is practically negligible)
What is the mass of an ion with 107 electrons?
electrons have negligible mass. the mass of the ion depends on how many protons and neutrons are present.
Why don't he include the electron in atoms mass?
when compared to the mass of protons and neutrons, the mass of the electrons is negligible and hence not included in atomic mass.
Why is the atomic mass generally used to refer to just the number of protons and neutrons?
The weight of an electron is negligible compared to that of protons and neutrons.
Which subatomic particles makes up most of the mass off the atom?
The major contribution to the mass of an atom is from protons and neutrons; electrons have a known but negligible mass.
What particle contributes a negligible amount to the atomic mass?
There are a number of particles of particularly low mass. Electrons have much less mass than either protons or neutrons, and so are negligible in calculating the mass of an atom. However, electrons are still much heavier than neutrinos or photons, which are even more negligible in mass.
How many neutrons does an atom with a mass of 13 and 9 protons?
the atomic mass of carbon 13 is 13 lt has six protons how many neutrons does this isotope
What makes an element more massive?
The more protons and neutrons that are in the element and isotope electrons are negligible in terms of mass.
Which particles account for most of the atoms mass?
Physics has not managed to discover a particle that accounts for mass
What subatomic particle does not make a significant cintribution to the mass of an atom?
The electron - both neutrons and protons weigh one amu, but the mass of an electron is negligible.
Where in the atom do you find the mass of the the atom?
Since most of the mass of an atom is contained in the protons and neutrons --and since these are in the nucleus --the mass of an atom is considered to be at its center. The electron has 1,000 times less mass than the proton, and it is moving pretty fast--so its mass is considered negligible. Values for average atomic masses can be found on any periodic table. The number comes from the number of protons + the average number of neutrons (as a percentage) in all isotopes.
