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We can find Atomic Mass and mass number in chemical elements. Atomic Mass is about weight of the atom. Mass number is about total of neutrons and protons.

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Obie Ondricka

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Q: Why is the atomic mass number not a whole number?
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Why atomic mass is always a whole number but atomic weight may be a decimal number?

Atomic mass of isotopes is not a whole number.


What is the nearest whole number of atomic mass of potassium?

The nearest Whole number of atomic mass of potassium is 69


Is the atomic mass of an element is always a whole number of atomic mass untis?

No.


Why the relative atomic mass is not a whole number?

Bexause its similar with the atomic mass


What is an element's atomic mass not listed as a whole number on the periodic table?

Few elements have isotopes. their atomic mass is not a whole number.


Is 40.08 the atomic number?

No. Atomic number is always a whole number. This would be the atomic mass.


How do you find the atomic mass and the atomic number?

The atomic number is the whole # on the periodic table or the # of protons in an atom. The atomic mass is the # that is not the whole # on the periodic table, or you can multiply the mass of the isotope by its abundance and add the answers together.


Why is the atomic mass of an element not a whole number while the atomic number is?

The atomic number refers to the number of protons in the atom. Since the proton cannot be an in-between number, the atomic number will have to be a whole number. On the other hand, the atomic mass does not have to be a whole number because it is the mass of an atom and is roughly equivalent to the number of protons plus the average number of neutrons in that particular element.


What is the weighted average mass of all the know isotopes for an element?

It is its Atomic Mass and why atomic mass is frequently not a whole number.


Can explain in terms of isotopes why the relative atomic mass of atomic number 17 is not a whole number?

Mass number is the average of all the naturally occurring isotopes of that element. When calculated, this average is not a whole number.


Is the mass number and the atomic mass the same?

No, the Atomic Mass is the full complete mass while the mass # is just the whole number. For example: carbon's atomis mass is 12.011 and the mass # is 12.


What is 4.00260 rounded to in atomic mass?

It is 4.0026 : the atomic mass can be a fraction.