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Proton and Neutron
OK, in very very round figures, but the neutron actually is more massive.
- In the first approximation, the neutron's mass about as much as a proton plus one electron or (P)938.235 MeV + (e)0.51098 MeV = 938.74598 MeV.
- In the second approximation, the energy of the neutrino, photon, and electron velocities ejected in free neutron beta decay would be added, but I can't find that in my references right now so I'll skip the math.
- There are probably also third approximation terms to account for, if not more.
- As measured, the neutron's mass is 939.529 MeV.
What else can I help you with?
What particle consists of two protons and two neutrons it is the same as a helium nucleus release of a what particle by an atom decreases the atomic number by 2 and the mass number by 4?
The particle that consists of two protons and two neutrons, equivalent to a helium nucleus, is an alpha particle. When an atom releases an alpha particle, its atomic number decreases by 2 and its mass number decreases by 4.
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 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.
What is the mass number to an alpha particle and why?
Mass number is defined as the number of nucleons present in the nucleus. Alpha particle is nothing but the doubly ionized helium atom or the nucleus of helium atom. Nucleon is the common name both for proton and neutron. Helium nucleus has two protons and two neutrons. So the number of nucleons within it is 4. Hence mass number is 4.
What change is atomic number occurs when a nucleus emits an alpha particle?
An alpha particle is composed of two protons and two neutrons, so when an atom loses an alpha particle, its mass number decreases by four. However, since the atom loses two protons, it is now a different element. It is now the element with an atomic number minus the two protons.
What particle consists of two protons and two neutrons it is the same as a helium nucleus release of a what particle by an atom decreases the atomic number by 2 and the mass number by 4?
The particle that consists of two protons and two neutrons, equivalent to a helium nucleus, is an alpha particle. When an atom releases an alpha particle, its atomic number decreases by 2 and its mass number decreases by 4.
What two particle's account for almost all of the mass of an atom?
Protons and neutrons.
The nucleus of a helium atom is called?
The nucleus of a helium atom is called an alpha particle. The electromagnetic waves emitted by a nucleus are called gamma rays.
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 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.
How massive is a alpha particle?
an alpha particle is made of two protons and 2 neutrons. its basically the same as the nucleus of a helium atom
What is the mass number to an alpha particle and why?
Mass number is defined as the number of nucleons present in the nucleus. Alpha particle is nothing but the doubly ionized helium atom or the nucleus of helium atom. Nucleon is the common name both for proton and neutron. Helium nucleus has two protons and two neutrons. So the number of nucleons within it is 4. Hence mass number is 4.
What two particles in an atom have approximatley the same mass?
Proton and neutron.
Two atom of the same elements with different mass number was?
ISotopes
What change is atomic number occurs when a nucleus emits an alpha particle?
An alpha particle is composed of two protons and two neutrons, so when an atom loses an alpha particle, its mass number decreases by four. However, since the atom loses two protons, it is now a different element. It is now the element with an atomic number minus the two protons.
What element has atomic structure similar to an alpha particle?
The element with atomic structure similar to an alpha particle is helium. An alpha particle consists of two protons and two neutrons, the same as the nucleus of a helium atom.
What does a radioactive atom lose as it increases its atomic number by one?
An electron, also known in this context as a beta particle.
