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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.
What else can I help you with?
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?
Physics has not managed to discover a particle that accounts for mass
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?
No two subatomic particles have the exact same mass. The proton and the neutron, however, come close. Neutrons are heavier than protons by only 2.3 X 10-30 kg.
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?
There're two particles in the atom nucleus (protons and neutrons)
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.
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.
