The atomic number
Number of protons + Number of neutrons = Mass number(number of nucleons)
No, the mass number of an element represents the total number of protons and neutrons in its nucleus. To find the number of protons, you would look at the element's atomic number, which is the smaller number on the element's symbol.
The mass number is the sum of protons + neutrons.
Find the atomic number. That tells you the number of protons and electrons (in a neutral atom). Then find the atomic weight. The number of protons plus the number of neutrons will equal the atomic weight. So if you know the wt. just subtract the number of protons and you will have the number of neutrons.
The number protons in an atom is called the atomic number (it is this number that tells us which element the atom is). The number of neutrons in an atom can change, but the term for the amount of neutrons is called an isotope. The number of protons and neutrons added together is called the atomic mass.
The Atomic Mass of an element tells you what the mass of one mole (6.022 x 1023 atoms) of the element is. It sort of tells you the number of protons & neutrons in the atom, but that is not necessarily precise.
An element's mass number tells us the total number of protons and neutrons in its nucleus. It helps to determine the element's atomic mass and differentiate it from other isotopes of the same element.
An atom of Krypton-78 contains 36 protons and 42 neutrons. Krypton has an atomic number of 36, which corresponds to the number of protons. Subtracting the atomic number from the atomic mass gives the number of neutrons.
The atomic mass number tells how many protons and neutrons are in a nucleus.
The Atomic Mass number tells how many protons and neutrons are in a nucleus.
The mass number of an isotope tells you the total number of protons and neutrons in the nucleus of that atom. It is used to distinguish different isotopes of an element, as isotopes of the same element have the same number of protons but different numbers of neutrons.
Protons, electrons, and neutrons are the three main parts of atoms. In an atom, the nucleus contains the protons and neutrons, the electrons are found in shells around the nucleus. On the periodic table, the atomic number tells you the number of protons of an element.