atomic number
Mass number!:)
The mass number of an atom is the sum of its protons and neutrons. For a zinc atom with 37 neutrons, the mass number would be the number of protons (30 for zinc) plus the number of neutrons (37), which equals 67.
The mass number is the sum of protons + neutrons.
An atom with 55 protons is a cesium atom. The mass number is the sum of the numbers of protons and neutrons, in this instance 131. Therefore, the atom is Cs-131.
20. the mass of an atom is determined by the sum of the number of neutrons and protons the atom has.
Protons and neutrons.
The nucleon number (or mass number).
Mass number = Protons+Neutrons
The sum of all Protons and Neutrons.
The sum of the number of protons and neutrons in an atom
The sum of protons and neutrons in an atom is called mass number.
protons and neutrons in an atom. It is the sum of protons and neutrons in the nucleus of an atom.
Mass number!:)
The sum of protons and neutrons is the atomic mass.
The mass number of an element is equal to the sum of the elements neutrons and protons.
The mass number of an atom is the sum of the protons and neutrons in its nucleus. Therefore, for an atom of calcium with 20 protons and 20 neutrons, the mass number would be 40.
The atomic mass of an atom is the total mass of protons, neutrons, and electrons in the atom, measured in atomic mass units (amu). It is approximately equal to the sum of the number of protons and neutrons in the atom's nucleus.