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The Atomic Mass unit is defined to be 1/12 of the mass of a carbon-12 atom. Atomic masses can determined by weighing molar amount of an isotope.
Absolute masses (in kg) are determined by measuring the amount that charged atoms are deflected by magnets, since if you know the charge you can calculate mass from the amount of deflection.
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∙ 11y ago
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∙ 13y agoOnly protons and neutrons contribute towards the mass of the atom.
Since mass of protons and neutrons are almost same whereas the mass of an electron is about 1/1800 times the mass of proton. Therefore, mass of electron is not counted towards the mass of the atom since it is almost negligible even in comparison to the
the mass of a proton whose mass itself is very small.
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∙ 14y agoElectrons, more specifically, valence electrons.
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∙ 13y agoProtons and neutrons and in a less proportion electrons.
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∙ 15y agoAtomic mass is determined by the combined masses of the protons, neutrons, and electrons found in an atom.
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∙ 13y agoAtom mass is mainly determined by the number of protons AND neutrons.
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∙ 12y agoAll the particles contribute to the mass of the atom; but the contribution of protons and neutrons is important - the contribution of electrons is very low.
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∙ 11y agoNeutrons and protons Atomic mass = mass of protons + mass of neutrons
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∙ 10y agoProtons and neutrons determine the atomic mass of an atom.
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∙ 11y agoThe number of protons plus neutrons, or the number of protons, neutrons, and electrons. You figure out which one. I helped a little. :)
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In Bohr's model which particles make up the most mass of the atom?
the electron particles make up the mostr mass
Which particles account for most of the atoms mass?
Physics has not managed to discover a particle that accounts for mass
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.
What does the number of neutrons determine?
they determine the atomic mass of the atom
Which two particles make up the mass of an atom?
. . . 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.idk dont asqq meehThe 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.
Which of the following particles is used to determine the mass of an atom?
Mass of an atom is determined by the no. of protons+ no. of neutrons in the atom.
How do you determine the numbers of the three types of particles in each atom?
In an atom, no. of protons = no. of electrons=atomic no. no. of neutrons=atomic mass-atomic no.
What is counted in an atom to determine mass number?
NEUTRONS AND PROTONS are counted in an atom to determine it's mass number.
What particles are used to determined the mass of an atom?
Mass of an atom = mass of protons + mass of neutrons
How do you determine the atom the atomic mass of an atom?
Proton + Nuetron = Atomic Mass
Which particles in a atom have a mass of 1?
protons and nuetrons
What are the subatomic particles that determine an atom's chemical behavior?
electrons
What subatomic particle or particles contributes the most to the mass of the atom?
These particles are protons and neutrons.
In Bohr's model which particles make up the most mass of the atom?
the electron particles make up the mostr mass
How do you determine an atom's mass number?
mass number= no. of protons + no. of neutron
What particles make up the atomic mass number of an element?
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.
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.
