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These particles are proton and neutron.

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Q: Which sub atomic particle makes up most of the mass of atom?
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The neutral particle of an atom weighing approximately one atomic mass unit?

This atomic particle is the neutron.


What sub atomic particle does not particitpate in the calculation of mass of atom?

Mass of electron is not included for the calculation of mass of an atom.


What is the atomic mass-?

The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.


The atomic number increases but the atomic mass stays the same?

The atomic number increases but the atomic mass stays the same after the emission of a beta particle by a radioactive atom.


What happens to atomic number and atomic mass of an atom that emits alpha particle?

An alpha particle is a positively charged nuclear particle consisting of two protons bound to two neutrons. The atomic number of an atom decreases by 2 and the mass number decreases by approximately 4 when an alpha particle is ejected.


What is the heaviet particle of an atom?

The proton and neutron - both with a relative atomic mass of 1.


What is the subatomic particle that has the greatest mass?

The largest subatomic particle (by mass) is the proton. The mass of subatomic particles is measured in atomic mass units (amu). The proton has a mass of 1.007 amu, the neutron has a mass of 1 amu, and the electron has a mass of .0005 amu.


Sub atomic particle with an atomic mass unit of 1?

Either a proton or neutron has an atomic mass of 1. An electron's mass is actually extremely small in comparison. The majority of the weight of an atom is in the nucleus.


When an atom emits a 1 beta particle what can be said about is mass number and atomic number?

Emiting a beta particle is the result of a neutron changing into a proton so the atomic number increases by 1 and the mass number stays the same


What happens to an atom in terms of atomic mass and weight when it loses one particle?

If an atom looses an electron, neither the atomic mass nor atomic weight change appreciatively. If it looses a proton or neutron, both atomic mass and atomic weight decrease by one and it becomes an atom of a different element (on loss of a proton), or a different isotope of the same element (upon loss of a neutron).


How are the mass numbers and atomic number of a nucleus affected by beta particle?

We make atomic number by number of protons in a atom. We make mass number by total of both protons and neutrons.


How do you determine the atom the atomic mass of an atom?

Proton + Nuetron = Atomic Mass