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Q: Why is atomic mass usually not perfect whole number?
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Why is atomic mass usually a whole number?

It is not usually a whole number. It would appear that you have been misinformed.


Is there a difference between a perfect square and a square?

No, but a perfect square is usually the square of a whole number.


Which number in an element box on the periodic table is the atomic number?

The atomic number is the whole number indicating the number of protons. It is usually directly above or below the element symbol.


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 a whole number that can be named as a product of a number with itself?

A perfect square is a whole number that can be named as a product of a number with itself.


When determining the mass of an atom the electrons 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.


When determining the mass of an atom the electrons are not considered 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.