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Atomic mass number of the atom. The best way to remember it is: the majority of the mass of an atom is made up of the protons and neutrons (the electrons are very light!), therefore the atomic mass number is the sum of the protons and neutrons.

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11y ago

Mass number = Number of protons + Number of neutrons

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Q: The sum of the protons and the neutrons will tell the atomic what?
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What makes up nearly all of the atom's mass?

The sum of all Protons and Neutrons.


How many protons electrons and neutrons are there in the ion?

Without knowing which nuclide is in question, it remains safe to say that regardless of the element, in an ion the atomic number or count of protons differs from the number of electrons - and thus the atom is overall not electrically neutral - the definition of an ion. With fewer electrons than protons, it would be a positively charged ion (cation); with more electrons than protons, it would be a negative ion (anion). If the atomic number (proton number) is P, the charge is x and the mass number is M, then protons = P neutrons = M- P and electrons is the algebraic sum of P and x.


What makes one atom or element different than another?

Different atoms either have a different number of protons(which makes them different elements) or a different number of neutrons (which makes them isotopes of the same element).For example, hydrogen has one proton (and usually no neutrons) while helium has two protons (and usually two neutrons). However, hydrogen with one proton and two neutrons is called tritium(3H) while helium with two protons and one neutron is called helium-3 (3He).


If uranium atomic number is 92 and it has 10 neutrons how many?

You can't have that combination. Such an atom wouldn't be stable - not even for a tiny fraction of a second.The atomic mass is the sum of the atomic number (i.e., the number of protons), and the number of neutrons.


What charge is a nucleus?

neutral

Related questions

What does the protons and neutrons tell you about the oxygen atom?

protons will tell the atomic number (8) the sum of protons and neutrons will give the mass number of the element


In periodic table of elements it is the sum of the number of protons and neutrons of an atom.?

The sum of protons and neutrons is the atomic mass.


What is the sum of the protons and nuetrons in an atomic number?

atomic number is the number of protons. the sum of protons and neutrons is known as mass number


How do you calculate the atomic mas based on the number of protons and neutrons of an atom?

To calculate the atomic mass of an atom, you would add the number of protons and neutrons together. Protons and neutrons each have a mass of approximately 1 atomic mass unit (amu). The sum of the protons and neutrons will give you the atomic mass of the atom in atomic mass units.


The sum of the protons and neutrons in an atom is its?

atomic number


Is the is the sum of the numbers of protons and neutrons in an isotope of the element?

Isotopes involve different atomic masses. It is sum of number of protons and neutrons.


What number is the atomic mass equal to?

The atomic mass of an element is equal to the sum of the number of protons and neutrons in its nucleus. It is not directly related to the atomic number, which represents the number of protons in an atom.


What is the atomic mass of a atom?

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.


What does the atomic mass tell you about the element and it's protons and neutrons?

The atomic mass of an element represents the average mass of its isotopes, taking into account their abundance. It is the sum of the protons and neutrons in the nucleus of an atom. By subtracting the atomic number (number of protons) from the atomic mass, you can determine the number of neutrons in the nucleus.


An atom has 14 protons and 13 neutrons what it its atomic mass?

The atomic mass is the sum of the number of protons and neutrons in an atom. In this case, the atomic mass would be 14 (protons) + 13 (neutrons) = 27.


How do you find the ratio of neutrons to protons?

The ratio of neutrons to protons in an atom can be calculated by subtracting the atomic number (number of protons) from the atomic mass (sum of protons and neutrons) of the atom. Mathematically, ratio of neutrons to protons = (Atomic mass - Atomic number).


What is the atomic mass of gallium with 39 neutrons?

The atomic mass of an element is the sum of protons and neutrons in its nucleus. Gallium has an atomic number of 31, which means it has 31 protons. If it has 39 neutrons, then its atomic mass would be 31 (protons) + 39 (neutrons) = 70.