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because it's an average of various isotopes, in proportion in which they exist in nature

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Q: The atomic mass of iron is 55.847 amu. Why isn't this value a whole number?
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Why isn't 55.847 a whole number?

Because its rational equivalent, in simplest form is 55847/1000. The denominator is not 1.


Why isn't 55.847 amu a whole number?

Because the equivalent rational expression is 55847/1000 which cannot be simplified so that the denominator is 1.


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.


Is 40.08 the atomic number?

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


What is the the atomic number for carbon rounded to the nearest whole number?

6. An atomic number is always a whole number, so it does not need rounding.


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

The nearest Whole number of atomic mass of potassium is 69


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 element has the atomic number for 3.14?

No element has this atomic number. All atomic numbers are whole numbers.


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.


When determining the mass of an atom the electron are not considered why can scientists disregard the electrons?

Usually they are measuring just the necleus of the atom since it would be a whole number. This is called finding the Mass number. The atomic weight is the whole atom together, which is a whole lot of decimals. So they take the atomic weight and round it to a whole number for the mass number. For example, Boron (an element on the table) has an atomic weight of 10.811. But scientists round the number upward to 11 to be the Mass number.


Why at atomic number not whole number in most case?

The question is based on an ignorance of what an atomic number is. It represents the number of protons in an atom of the element and is always, ALWAYS a whole number.


What whole number has the value of 0.4?

0.4 is not a whole number and so no whole number has a value of 0.4