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.
In this case, the number 209 represents the sum of protons + neutrons.
To calculate the number of subatomic particles in isotopes, you need to know the atomic number (number of protons) and mass number (sum of protons and neutrons) of the isotope. Subtract the atomic number from the mass number to find the number of neutrons. The number of electrons will be equal to the number of protons if the atom is neutral.
The total number of subatomic particles in the nucleus is the sum of protons and neutrons. For the common isotope of iron with an atomic number of 26, there are 26 protons. Given the mass number of 56, the number of neutrons can be calculated as 56 - 26 = 30. Therefore, the total number of subatomic particles in the nucleus is 26 protons + 30 neutrons = 56 particles.
The number of subatomic particles in an atom is determined by its atomic number and mass number. The atomic number, found on the periodic table, indicates the number of protons, which also equals the number of electrons in a neutral atom. The mass number, the sum of protons and neutrons in the nucleus, helps us calculate the number of neutrons by subtracting the atomic number from the mass number. This information allows us to fully characterize the subatomic structure of any given atom.
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 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 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.
That is the atomic mass number, which generally is the number of protons plus the number of neutrons in the nucleus of an atom. The atomic mass number varies between the different isotopes of an element. All isotopes of the same element have the same number of protons, or atomic number, but have different numbers of neutrons. For example, carbon-12 atoms have 6 protons and 6 neutrons, while carbon-14 atoms have 6 protons and 8 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 isotope 85Br has 35 protons and electrons; also 45 neutrons.