It tells you how many nucleons (protons and neutrons) there are in the nucleus.
atomic mass is the number of protons in that element molecule.
Rubidium is a metal element. Mass number of it is 85.
Sodium is a metal element. Mass number of it is 23.
90
Vanadium is a metal element. Mass number of it is 51.
Magnesium is a metal element. Mass number of it is 24.
Copper is a metal element. Mass number of it is 64.
The element with a mass number of 37 is chlorine (Cl).
isotopes just mean they have a different number of neutrons so if the..Mass number = # of protons + # of neutrons -they will have a different (greater) mass
The atomic number of an element is the number of protons in the nucleus of each atom of the element. Mass number is a property of a particular isotope of the element rather than of the element itself: The mass number is the sum of the numbers of protons and neutrons in the nucleus of each atom of the isotope.
The element with mass number 27 is cobalt, which has 27 as its atomic mass.
The element with a mass number of 52 is Chromium (Cr). It's atomic number is 24.