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The mass of an electron is many, many orders of magnitude (each order of magnitude = X^10) lower than that of protons and nuetrons so that they can be considered as irrelevant relative to the heavier constituents.
This several orders of magnitude relevency "approximation" is a common practice in many andvanced sciences and applied engineering fields when calculating "bulk" or "gross" properties. It may not be applied, however, when investigating influences on/from and other applications of the "very, very large" and/or the "very, very small".
As well, the mass of the electrons is so minute that it makes almost no difference... but technically it is included, just not commonly shown for "schooling"
What else can I help you with?
Why don't we count electrons in determining the atomic mass?
Electrons have such a small mass relative to protons and neutrons that they are typically not included in calculations of atomic mass. The mass of electrons is about 1/1836 of the mass of a proton or neutron, so their contribution to the overall mass of an atom is negligible. Instead, atomic mass is primarily determined by the sum of the number of protons and neutrons in the nucleus of an atom.
How can the number of protons electrons and neutrons be calculated when giving the mass number?
The atomic number must be known along with the mass number. Then the number of protons or electrons is the same as the atomic number, and the number of neutrons is the difference between the mass number and the atomic number.
What element has 25 protons 25 electrons and a mass number of 56?
The isotope 56Mn has 25 protons, 25 electrons, 31 neutrons and a mass number of 56.
Is the mass number equal to the number of protons and electrons?
No, it isn't. The mass of an electron is significantly smaller than that of a proton.The mass of 1,800 electrons is about the same as the mass of one single proton.The antiparticle of the electron, the positron, has the same mass as the electron.the mass of the electron is not the same to the mass of the proton
Why doesnt the mass number change when electrons are added or removed?
The mass number represents the total number of protons and neutrons in an atom's nucleus. Electrons, which are negatively charged particles, have negligible mass compared to protons and neutrons. Therefore, adding or removing electrons does not significantly affect the mass number of an atom.
Atomic mass is number of protons added to the number of neutrons. Why is number of electrons not included in it?
Because electrons are very light particles and do not effect the mass, if proton and neutrons are elephant then electrons are ants , how ants effect the mass and weight of elephant ?
Which subatomic particles have mass and re included in the calculation of the atomic mass number?
Protons and neutrons are the subatomic particles that have mass and are included in the calculation of the atomic mass number. Electrons have very low mass compared to protons and neutrons and are usually not included in the atomic mass calculation as they contribute very little to the overall mass of an atom.
Why is the mass of an atom electrons not included in the atoms mass numbers?
Mass number is defined as the number of protons and neutrons. It is related to Atomic Mass which incudes electron mass and nuclear binding energy , (binding energy reduces the overall mass relative to the combined masses of the protons and neutrons.) Electron mass is not included as mass number is element specific wheras the count of electrons varies depending on the chemical state. The mass of electrons is negligible compared to the mass of the protons and neutrons, binding energy is a larger effect.
Why is the mass of an atoms electrons not included in the atoms mass number?
Mass number is defined as the number of protons and neutrons. It is related to Atomic Mass which incudes electron mass and nuclear binding energy , (binding energy reduces the overall mass relative to the combined masses of the protons and neutrons.) Electron mass is not included as mass number is element specific wheras the count of electrons varies depending on the chemical state. The mass of electrons is negligible compared to the mass of the protons and neutrons, binding energy is a larger effect.
Is An atom's atomic mass is the total mass of all of its electrons and protons?
No, an atom's atomic mass is the sum of the total number of protons and neutrons in its nucleus. Electrons have such a tiny mass that they are usually not included in the calculation of an atom's atomic mass.
How do you find the mass number without knowing the number of electrons?
The mass number doesn't depends on the number of electrons.
How is electrons and mass number related?
it isn't - the number of electrons in an atom will be the same as the proton number of that atom, but the mass of an atom includes the number of neutrons, and in every stable element heavier than hydrogen, the number of neutrons is the same as or greater than the number of protons. Also, the mass will vary between isotopes of the same element, which will contain the same number of protons and hence electrons but a different number of neutrons. Generally, in stable nuclei, as the number of electrons in an atom in creases, the mass increases as well, but these are not directly linked as to be stable, heavier nuclei require a greater proportion of neutrons in the nuclei so will have a greater mass to electron number ratio
Why don't we count electrons in determining the atomic mass?
Electrons have such a small mass relative to protons and neutrons that they are typically not included in calculations of atomic mass. The mass of electrons is about 1/1836 of the mass of a proton or neutron, so their contribution to the overall mass of an atom is negligible. Instead, atomic mass is primarily determined by the sum of the number of protons and neutrons in the nucleus of an atom.
What is counted in an atom to determine mass number?
The mass number of an atom is determined by counting the total number of protons and neutrons in its nucleus. Electrons, which are much lighter than protons and neutrons, are not included in the mass number calculation.
An element's atomic mass does not include the mass of its?
An element's atomic mass does not include the mass of its electrons. Electrons have such a small mass compared to protons and neutrons that they are not typically included in calculations of atomic mass.
What and what make up the atomic mass?
The atomic mass of an element is the sum of the number of protons and neutrons in the nucleus of an atom. Protons have a positive charge and neutrons have no charge, contributing to the overall mass of the atom. The number of electrons, which have a negligible mass, is not included in the atomic mass.
How do you tell the number of neutrons in an element?
Subtract the atom number from the mass number to get the neutron. Mass number is the sum of neutrons and electrons. Atom number is the number of electrons. the number of electrons is equivalent to the number of protons.
