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No, it is not.
The Atomic Mass for an isotope of an element is usually close to a whole number but never exactly so. This is because most elements exist in a number of isotopic forms: they are made up of the same number of protons and electrons but differ in the number of neutrons. So the mass of each isotope of the same element will differ from other isotopes by a whole number of mass units. The atomic mass of the element is the average mass of all its isotopes, weighted together in proportion of the abundance of the elements.
The worst offender is dysprosium. The element has 66 proton and electrons 162.5.
164-Dy has a mass of 163.929 and accounts for 28.3% of the Dy on earth,
162-Dy has a mass of 161.927 and accounts for 25.5% of the Dy on earth,
163-Dy has a mass of 162.929 and accounts for 24.9% of the Dy on earth,
and there are 4 more isotopes accounting for smaller proportions. When averaged, the atomic mass for Dy is 162.5 - as far from a whole number as you can get!
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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.
How do you converting from atomic percent to weight percent?
How can I convert atomic percent to weight percent for example TiC -45%atomic C convert to weight percentage?
What does the number 2 and 4003 mean of helium?
Helium has atomic number 2. That means the helium atom has 2 protons and two electrons. The standard atomic weight of helium is 4.002602, or 4.003 rounded to 3 decimal places.
A fraction and a whole number with a whole number product?
The answer can be another fraction and a whole number or it can be a whole number.
A product of a given whole number and another whole number?
A product of a given whole number and another whole number = whole numbers
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.
Why don't the elements on the periodic table have a whole number as their atomic weight?
Elements exist as isotopes in nature. So their atomic weight is not a whole number.
Why is the atomic mass number not a whole number?
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.
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.
How do you find the number of nucleons?
To find the number of neutrons in an atom, first find the atomic weight of the element and round that number to the nearest whole number. Then, find the atomic number of the element. Subtract that number from the atomic weight and the number of neutrons will be found.
What is the number of neutorns in nitrogen?
To find the number of neutrons, all you need to do is round the atomic weight to the nearest whole number. The atomic weight of nitrogen is 14.007, or about 14. The atomic weight is basically the average number of particles in an atom's nucleus. What particles are located in the nucleus?? The protons and the neutrons. So, all you have to do is subtract the number of protons from the atomic weight and you get the neutrons!!HERE'S HOW YOU DO IT:Nitrogen's atomic # = 7Nitrogen's atomic mass = 14Neutrons + Protons = Atomic Mass so... 14-7=7The number of neutrons is 7.
Is the atomic weight the same as the atomic number?
No, the atomic number is the number of protons that an atom contains. Atomic weight is the number of protons and neutrons.
How was is the atomic number and the atomic weight of uranium found?
Atomic number of uranium: 92 Atomic weight of uranium: 238,02891
Atomic weight and atomic number of copper?
Its atomic number is 29 and its standard atomic weight is 63.5 g/mol.
What is the number of neutrons in an atomic number?
Subtract the atomic number from the atomic weight.
What is the number in front a chemical formula is called?
atomic number or atomic weight. Subscript: atomic number, superscript: atomic weight: 94Pu239 or 239Pu
