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Suppose a newly discovered element has three isotopes that occur in nature Assume that these isotopes occurr in equal amounts in nature What will be the average atomic mass of this element?
Wiki User
∙ 10y ago
You would add 200+203+209 and get 612. Then divide 612 by three. (612/3) to get that the average Atomic Mass is 204.
Wiki User
∙ 10y ago
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Why cant you add the average masses of each of the isotopes and divide to get overall average of the atoms?
Because the isotopes do not appear in equal amounts. This is hardly surprising since many isotopes experience radioactive decay and change to other elements after decay while stable isotopes persist - thus stable isotopes will usually dominate as the most common isotopes for individual elements with those with the longest half-lifes being more common than those with shorter half-lifes. Of course when you get into the heaviest elements there don't seem to be any stable isotopes so those with longest half life dominate.
Why is the average atomic mass included in the periodic table?
The average atomic mass is included in the periodic table due to the varying amounts of isotopes that exist on the planet for each atom. Because isotopes of atoms have a different weight than the original, the atom can be found weighing different amounts depending on how much of the isotope is present. These ratios in isotope amounts change over time. The average atomic mass of Carbon on a table from the 1960's will not be same as the mass on a table from 2000's. Although these changes will be small, in calculations they can add up to significant differences in results.
Weighted average mass of the mixture of its isotopes?
Average atomic mass I think.
Why is the atomic mass of copper not exactly equal to 64 midway between the mass numbers of copper-63 and copper-65?
Because copper has isotopes. All Copper atoms have exactly the same number of protons, but not all of them have the same number of neutrons. The ones with different numbers of neutrons are known as isotopes. A given sample of Copper will contain various amounts of each of its isotopes. The atomic mass (weight) is an average weight, based on the percentages of the isotopes
Why is an elements atomic mass not listed as a whole number on the periodic table?
Most elements have more than one isotope stable against radioactive decay, and these isotopes, each of which individually has an integral mass number, occur naturally in amounts that do not lead to integral average gram atomic masses.
What is the average mass of the mixture of an elements isotopes?
All of the isotopes in an element's atomic masses divided by the amount of isotopes there are is the weighted-average mass of the mixture of an elements isotopes.
Why cant you add the average masses of each of the isotopes and divide to get overall average of the atoms?
Because the isotopes do not appear in equal amounts. This is hardly surprising since many isotopes experience radioactive decay and change to other elements after decay while stable isotopes persist - thus stable isotopes will usually dominate as the most common isotopes for individual elements with those with the longest half-lifes being more common than those with shorter half-lifes. Of course when you get into the heaviest elements there don't seem to be any stable isotopes so those with longest half life dominate.
Why is the average atomic mass included in the periodic table?
The average atomic mass is included in the periodic table due to the varying amounts of isotopes that exist on the planet for each atom. Because isotopes of atoms have a different weight than the original, the atom can be found weighing different amounts depending on how much of the isotope is present. These ratios in isotope amounts change over time. The average atomic mass of Carbon on a table from the 1960's will not be same as the mass on a table from 2000's. Although these changes will be small, in calculations they can add up to significant differences in results.
Why is the mass number of lithium 7?
6.941 is the average mass of lithium's isotopes. The majority of lithium (on average about 92.5%) is lithium-7 with 3 protons and 4 neutrons while about 7.5% is lithium-6 with 3 protons and 3 neutrons. A number of other isotopes exist but only in trace amounts.
Is an average mass of the different isotopes of the element?
Yes, weighted by how often the isotopes are found in nature.
What is weighted average mass of an element isotopes?
average atomis mass
What is the average of all the naturally occurring isotopes of a particular element?
The average of all the naturally occurring isotopes of a particular element are an element's atomic Mass.
Is the reason that an element's average atomic mas is often a decimal number stems from the fact that elements have isotopes?
Yes, the reason that an element's average atomic mass is often a decimal number is the fact that most elements have more than one isotope stable against radioactive decay and that these isotopes, each of which individually has an integral mass number, occur naturally in amounts that do not lead to integral average gram atomic masses.
Which is the average of the mass numbers of an element's isotopes?
the Atomic Mass
Why is the atomic mass of copper not exactly equal to 64 midway between the mass numbers of copper-63 and copper-65?
Because copper has isotopes. All Copper atoms have exactly the same number of protons, but not all of them have the same number of neutrons. The ones with different numbers of neutrons are known as isotopes. A given sample of Copper will contain various amounts of each of its isotopes. The atomic mass (weight) is an average weight, based on the percentages of the isotopes
What is the average mass of the isotope of an element?
the average mass numbers of the isotopes of an element
Weighted average mass of the mixture of its isotopes?
Average atomic mass I think.
