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. . . the two with (appreciable) mass: protons and neutrons.
The Atomic Mass number of an element is determined by mass of the nucleus of an atom. Therefore the particles that make up the nucleus determine the mass number. These particles are protons and neutrons.
The mass of the protons and neutrons do not vary between elements, but the number of each in the nucleus varies between elements and between isotopes of the same element.
Protons and neutrons.
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The sum of the numbers of protons and neutrons determine the mass number. Electrons have negligible mass compared to protons and neutrons.
The particles counted are neutrons and protons each having a relative atomic mass of 1. The atomic number is the number of protons.
Atomic mass of an atom is the mass of the nucleus.
Hence the atomic mass is the sum of the number of protons an neutrons present in the nucleus of the atom. The electrons are not considered as their mass is negligible compared to the mass of the neutrons and protons.
Wiki User
∙ 11y ago
Protons and neutrons make up the mass of an atom. Protons carry a positive charge, while neutrons are neutral in charge. Electrons, which have a much smaller mass than protons and neutrons, are responsible for the atom's size.
Wiki User
∙ 9y agoThe three particles that make up an atom are protons, neutrons and electrons. However, electrons have a mass of 1/1837 of that of a proton or a neutron, which is a negliglible mass and therefore does not contribute to the mass of an atom. Therefore, the mass number of an atom is the sum of the number of protons and the number of neutrons.
Wiki User
∙ 12y agoThe answer your teacher is almost certainly looking for is "protons and neutrons", though this is an exceptionally poor question and your teacher deserves 40 lashes with a wet noodle for asking it.
Here's why:
- The bulk of the mass of an atom is due to protons and neutrons, but electrons are not massless and make a small contribution also
- Protons and neutrons are themselves made up of smaller particles called quarks, which are also subatomic particles and also have mass
- The mass of an atom is not quite as simple as the mass of a proton times the number of protons plus the mass of a neutron times the number of neutrons; there's something called "mass defect" or "binding energy" that can make a significant contribution
- The lead contender for the particle that "plays a role in" mass is the Higgs boson
Wiki User
∙ 9y agoThese two important particles are neutrons and protons.
Wiki User
∙ 11y agoProtons, and neutrons when present, make up the majority of the mass of an atom
Wiki User
∙ 12y agoProtons and Neutrons.
Wiki User
∙ 12y agoneutrons and protons
Wiki User
∙ 15y agoProton and neutron
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Which two particles make up most of the mass of a hydrogen-2 atom?
The two particles that make up most of the mass of a hydrogen-2 atom are the proton and neutron. The proton has a positive charge and is responsible for defining the element, while the neutron has no charge and helps stabilize the nucleus.
Which two subatomic particles make up most of the atoms mass?
It is usually considered to be neutrons and protons that hold most of an atom's mass, however there is one theoretical subatomic particle that is used to help explain mass, called the higgs boson particle.
Which particles account for most of the atoms mass?
Protons and neutrons account for most of an atom's mass. Electrons have a very small mass compared to protons and neutrons.
What are the two aromic particles found in the necleus of an atom?
Protons and neutrons are the two atomic particles found in the nucleus of an atom. Protons have a positive charge, while neutrons have no charge and contribute to the mass of the nucleus.
Where is most of the mass located in the helium atom?
Most of the mass in a helium atom is located in its nucleus, which contains two protons and usually two neutrons,forming a total of four particles called nucleons. The electrons only contribute a small fraction of the atom's overall mass.
Which two particles make up most of the mass of a C-12 atom?
proton and neutron
What are the two particles that makeup the mass of an atom?
protons and neutrons
What two particles in an atom have approximatley the same mass?
Proton and neutron.
What two particles of the atom are added together to get the atomic mass?
4
What are the two subatomic particles with a mass?
In the atom, protons and neutrons; the mass of the electron is very small.
What particle or particles carry virtually all the mass (weight) of any atom?
Virtually all of the mass of an atom is carried by the proton and the neutron. The electron has very, very little mass relative to these two particles.
Which two particles in the atom have the same mass?
Protons and neutrons have approximately the same mass in an atom. Both particles are located in the nucleus of the atom and are responsible for the majority of its mass.
Which two particles make up most of the mass of a hydrogen-2 atom?
The two particles that make up most of the mass of a hydrogen-2 atom are the proton and neutron. The proton has a positive charge and is responsible for defining the element, while the neutron has no charge and helps stabilize the nucleus.
What two atomic particles are in the nucleus of an atom?
Protons and neutrons are the two particles that are in the nucleus of an atom. Electrons orbit around the atom
What are two particles in an atom?
Protons and neutrons are the two particles found in the nucleus of an atom. Electrons are the third particle and they orbit around the nucleus.
What particles of atom are found in the nucleus?
The particles of the atom in the nucleus are the protons and neutrons. Protons carry a positive charge and neutrons have no charge. These two make up the vast majority of an atom's mass. Electrons, with their negative charges, orbit the nucleus in different energy levels.
What two subatomic particles do you add together to get the mass number?
The two subatomic particles you add together to get the mass number of an atom are protons and neutrons. Protons have a positive charge, while neutrons have no charge, but together they contribute to the mass of an atom.
