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The mass of one specific isotope, called the mass number, is the total number of protons plus neutrons. M = P + N

Therefore, for atomic number P, you would take the mass number minus the neutrons: P = M - N.

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Q: How do you find the atomic number of an element by looking at it's isotopes?
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Related questions

How do the atomic number of the different isotopes an element compare?

The atomic number is the same for the all isotopes of a chemical element.


What is the difference between atomic mass number and atomic number?

Atomic mass number is the average atomic mass for that element, which is : All the isotopes' masses known for that element averaged up. Atomic number is the element's "identity", the number of protons the element and all its isotopes have. All the isotopes of a given element will have different number of electrons and neutrons, but the protons of the element never will change.


Do isotopes have the same A number?

The atomic number is the same for the isotopes of a chemical element.


What atoms with same atomic number but different atomic masses?

Isotopes of the same element have the same number of protons (atomic number) but differ in number of neutrons (hence atomic masses).


What is a similarity and a difference between isotopes of an element?

All isotopes of an element have the same number of protons in the atomic nucleus, which is its atomic number on the periodic table. All isotopes of an element contain different numbers of neutrons in their atomic nuclei, which causes the isotopes of an element to vary in mass number (protons + neutrons).


Does an isotope of an element have a different atomic mass?

Yes; isotopes of the same element have the same atomic number but differ in their atomic masses.


Why some isotopes were written without its atomic number?

Different isotopes of an element have the same atomic number, they (only) differ in (atomic) mass NUMBER.


Atoms of same chemical element that have different atomic mass are known as?

Isotopes. They differ in the number of neutrons in the nucleus.


What identifies different isotopes of an element?

the atomic number


How do isotopes of an element differ?

Different isotopes of an element differ in the number of neutrons and thus in their atomic weight.


What is the atomic number of isotope?

Well all Isotopes have the same atomic number so if you have the element the atomic number of an element with that same isotope is that same atomic number.


Isotopes of the same element have differnt?

Different numbers of neutrons and hence different physical properties.