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Neutrons and Protons.

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Q: The mass number is the sum of which two subatomic particles?
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How do you determine sum of subatomic particles?

The mass number is the sum of protons and neutrons in the atomic nucleus.


What is the sum of the masses of the positively charged subatomic particles are called what?

You think probably to mass number; the mass number is the sum of protons and neutrons.


How many subatomic particles are in a symbol of a nuclide?

Symbols of nucldes doesn't contain symbols of subatomic particles. But: the atomic number is equal to the number of neutrons. Example: 235 92U (the fissile isotope of uranium) - 235 is the mass number (sum of protons and neutrons) - 92 is the number of protons and electrons


What subatomic particles contribute to the mass of?

The atomic mass is the sum of the number of protons and the number of neutrons found in each atom of that element (electrons do not contribute). They are sometimes seen on periodic tables to have a decimal in the atomic number, this is for elements with more than one common isotope (an isotope of an element is the same number of protons but with a different number of neutrons), in which case an average of the common isotopes can be used.


What is the total number of subatomic particles in the nucleus of an atom bi?

In this case, the number 209 represents the sum of protons + neutrons.


How many total number of particles present in one atom?

The answer depends on the atom! The total number of subatomic particles in an atom of an isotope is the sum of the mass number and the atomic number of the isotope; the mass number counts the protons and neutrons together, and the atomic number recounts the number of protons, which in a neutral atom must be the same as the number of protons.


Which two particles does the atomic mass number represent?

The sum of Protons and neutrons


How many subatomic particles are in the element xenon?

The "subatomic" particles in atoms are usually considered to be only protons, neutrons, and electrons, although these may contain sub-subatomic particles such as quarks and gluons. Every atom of xenon contains 54 protons and 54 electrons, because 54 is the atomic number of xenon. Every atom of xenon also contains neutrons. The lightest naturally occurring and radioactively stable isotope of xenon is Xe-124. Since the mass number is the sum of protons and neutrons, the total of protons, electrons, and neutrons for this isotope is 124 + 54 or 178. The number of particles for any other isotope of xenon may be found by adding the mass number to the atomic number.


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 is the sum of protons and neutrons known as an element?

Sum of protons and neutrons is the Mass number of the element. The number of protons is equal to the number of electrons. Neutrons and protons are sub atomic particles.


Sum of protons and neutons?

the mass number


What is the subatomic particles of oxygen?

neutrons, protons and electrons. _________ The above is incorrect; those are atomic particles. Subatomic particles are what those particles are made of. Quarks and leptons are subatomic particles.