Neutrons and Protons.
It is 13.2 grams.
The sum of any number and 0 is the original number.
let the number be n, then the sum of the number and 2 is n+2
If you add zero to any number, the sum is the same number you started with.
When the sum of a number plus 3 is squared, it is 11 more than the sum of the number plus 2 when squared.
The mass number is the sum of protons and neutrons in the atomic nucleus.
You think probably to mass number; the mass number is the sum of protons and neutrons.
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
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.
In this case, the number 209 represents the sum of protons + neutrons.
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.
The sum of Protons and neutrons
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 sum of protons and neutrons in an atom is called mass number.
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.
the mass number
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.