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Why do elements which exists as isotopes have fractional atomic mass?

Each isotope of an element has a different Atomic Mass, so an average is taken of all the isotopes, but the average is weighted because the natural abundance (%) of each isotope is factored in. If hydrogen-1 is much more abundant than deuterium and tritium, then the weighted average will be closer to 1 than 2 or 3 but not a whole number. The following equation shows how percent abundance factors into the weighted average. (atomic mass A)(X% abundance) + (atomic mass B)(Y% abundance)...=(weighted average of all isotopes of the element)(100% abundance)


The atomic mass of an element is defined as the weighted average mass of that element's?

atoms based on the abundance of each isotope. It is calculated by taking the mass of each isotope of the element multiplied by its relative abundance, then summing up these values to get the atomic mass.


Does the atomic mass of an element depend upon the relative abundance of each isotope of the element?

Yes, the atomic mass of an element takes into account the relative abundance of each isotope of that element. This is because atomic mass is the weighted average of the masses of all isotopes of an element based on their natural abundance.


How do you calculate the atomic mass of an element with different isotopes?

To calculate average atomic mass from different isotopes of an element, we take into account the relative atomic masses of isotopes and their relative abundance on Earth. The following formula is used to calculate the needful : atomic mass = mass of isotope x percent abundance + mass of isotope x percent abundance / 100 (whole expression divided by 100)


How do you calculate percent abundance for antimony?

The atomic mass of an element is the weighted average of the masses of its isotopes. You know that: Antimony-121 has a mass of 120.9038 u, x% abundance Antimony-123 has a mass of 122.9042 u, y% abundance There are only 2 isotopes for antimony and their percent abundances should add up to 100%. In other words: x% + y% = 100% y = 1-x (percentages written as decimals) So, now let's put everything together. In order to calculate the atomic mass, multiply the percent abundance of an isotope by its atomic mass; then add the product of all the isotopes: (Atomic Mass of Antimony-121)(Percent Abundance of Antimony-121) + (Atomic Mass of Antimony-123)(Percent Abundance of Antimony-123) = Atomic Mass of Element Antimony (120.9038 amu)(x) + (122.9042 amu)(y) = 121.760 amu Replacing 1-x for y gives: (120.9038 amu)(x) + (122.9042 amu)(1-x) = 121.760 amu Solve for x: 120.9038x + 122.9042 -122.9042x = 121.760 amu -2.0040x = -1.1442 x = 0.57096 = 57.096% Solve for y: y = 1 - x y = 1 - 0.57096 = 0.42904 = 42.904%

Related Questions

How do you work out the percent abundance of two boron isotopes?

To determine the percent abundance of two boron isotopes, you would typically need experimental data from a mass spectrometry analysis. The percent abundance can be calculated by comparing the relative intensities of the peaks corresponding to the two isotopes in the mass spectrum. By dividing the intensity of each isotope by the sum of both isotopes' intensities and multiplying by 100, you can find the percent abundance of each isotope.


What is the result when you total the individual percent abundance of isotopes of a given element?

How do you calculate percent abundance of an isotope?You find the isotope number and then you calculate that into a fraction and then turn the fraction into a percentage and divide it by the atomic number then times it by the mass and turn that answer into a percent and voila, there you have it.


How do you calculate the abundance of boron isotopes?

To calculate the abundance of boron isotopes, you would typically need to know the masses and natural abundances of each isotope. You can then use these values to calculate a weighted average, taking into account the abundance of each isotope relative to its mass. The formula for calculating isotopic abundance involves multiplying the natural abundance of each isotope by its mass and then summing these values for all isotopes.


When masses of all naturally occurring isotopes of a particular element are averaged the result is called the elements?

When the mathematical products of the mass of each naturally occurring isotope of a particular element, each mass being multiplied by the natural abundance fraction* of the particular isotope, are added, the result is called the element's atomic weight or, if the masses are expressed in grams per Avogadro's Number of atoms, the gram atomic mass._____________________________*The abundance fraction equals exactly 0.01 times the percent abundance of the isotope.


Why do elements which exists as isotopes have fractional atomic mass?

Each isotope of an element has a different Atomic Mass, so an average is taken of all the isotopes, but the average is weighted because the natural abundance (%) of each isotope is factored in. If hydrogen-1 is much more abundant than deuterium and tritium, then the weighted average will be closer to 1 than 2 or 3 but not a whole number. The following equation shows how percent abundance factors into the weighted average. (atomic mass A)(X% abundance) + (atomic mass B)(Y% abundance)...=(weighted average of all isotopes of the element)(100% abundance)


The atomic mass of an element is defined as the weighted average mass of that element's?

atoms based on the abundance of each isotope. It is calculated by taking the mass of each isotope of the element multiplied by its relative abundance, then summing up these values to get the atomic mass.


When the masses of all naturally occurring isotopes of a particular element are averaged the result of the elements?

When the mathematical products of the mass of each naturally occurring isotope of a particular element, each mass being multiplied by the natural abundance fraction* of the particular isotope, are added, the result is called the element's atomic weight or, if the masses are expressed in grams per Avogadro's Number of atoms, the gram atomic mass._____________________________*The abundance fraction equals exactly 0.01 times the percent abundance of the isotope.


If an element has 3 isotopes with known masses what other information is needed to find the average atomic mass of the element?

The abundance of each isotope is needed to find the average atomic mass of the element. The average atomic mass is calculated by multiplying the mass of each isotope by its abundance, summing those values, and then dividing by 100 to get the average atomic mass in atomic mass units.


When the masses are all naturally occurring isotopes of a particular elements are averaged the result is called a element?

When the mathematical products of the mass of each naturally occurring isotope of a particular element, each mass being multiplied by the natural abundance fraction* of the particular isotope, are added, the result is called the element's atomic weight or, if the masses are expressed in grams per Avogadro's Number of atoms, the gram atomic mass._____________________________*The abundance fraction equals exactly 0.01 times the percent abundance of the isotope.


If an element has three isotopes with unknown natural abundance percentages what other information is needed to find the average atomic mass of the element?

You would need the masses of each isotope and the abundance percentages of at least two of the isotopes. The average atomic mass is calculated by multiplying the mass of each isotope by its abundance, summing these values for all isotopes, and then dividing by 100.


Does the atomic mass of an element depend upon the relative abundance of each isotope of the element?

Yes, the atomic mass of an element takes into account the relative abundance of each isotope of that element. This is because atomic mass is the weighted average of the masses of all isotopes of an element based on their natural abundance.


How do you calculate the atomic mass of an element with different isotopes?

To calculate average atomic mass from different isotopes of an element, we take into account the relative atomic masses of isotopes and their relative abundance on Earth. The following formula is used to calculate the needful : atomic mass = mass of isotope x percent abundance + mass of isotope x percent abundance / 100 (whole expression divided by 100)