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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)
What else can I help you with?
Which member of group 7 that exists as 2 isotopes?
Bromine is the member of group 7 that exists as two stable isotopes: bromine-79 and bromine-81. These isotopes have slightly different atomic masses due to variations in the number of neutrons.
Why is the atomic mass of technetium usually in brackets?
The atomic mass of technetium is typically shown in brackets because technetium has no stable isotopes. Instead, it exists only in radioactive isotopes with varying masses, so the bracketed atomic mass represents the weighted average mass of these isotopes.
What is the atomic mass of radon?
The relative atomic mass of radonis indeterminiate because this element is relatively short lived and exists only as a transient decay product.
What is the atomic mass of Venus'?
No element name Venus exists. Elements' name derived from planets are Mercury, Uranium, Neptunium, and Plutonium
Are all atoms isotopes?
They are not directly equatable terms. Strictly, every atom from from one isotope of the relevant element - some elements having few stable isotopes, others having a number and most having at least one unstable (i.e. radioactive) isotope.
Why are molar masses not a whole number?
Molar masses are not whole numbers because they are calculated based on the average mass of isotopes present in a sample, taking into account the abundance of each isotope. Isotopes are elements with the same number of protons but different numbers of neutrons, leading to fractional atomic masses and consequently non-whole molar masses.
Which member of group 7 that exists as 2 isotopes?
Bromine is the member of group 7 that exists as two stable isotopes: bromine-79 and bromine-81. These isotopes have slightly different atomic masses due to variations in the number of neutrons.
Carbon exists as 12c6 and 14c6 these different forms of the same element are known as?
Isotopes. These are atoms of the same element with different numbers of neutrons, resulting in different atomic masses.
Is the atomic mass of an element equaled to the mass of an average atom?
The atomic weight is taken as the average weight or mass of the different isotopes of the Same atom That exists in the different %age in our enviromenT
What same elements have the same atomic number?
though your question is unclear, each element has its own atomic number. every sample of Sulfur (S) that exists has the atomic number of 16. No different elements share the same atomic number.
Why is the atomic mass of technetium usually in brackets?
The atomic mass of technetium is typically shown in brackets because technetium has no stable isotopes. Instead, it exists only in radioactive isotopes with varying masses, so the bracketed atomic mass represents the weighted average mass of these isotopes.
What is the atomic mass of radon?
The relative atomic mass of radonis indeterminiate because this element is relatively short lived and exists only as a transient decay product.
Why are atomic masses of elements usually not whole numbers?
The atomic mass listed in the periodic is found by taking the average of all the different isotopes of a given element found in nature, weighted for their natural abundance.Note that the atomic mass is not the same as the atomic weight. The atomic mass is the weight of one specific isotope of one atom, and is expressed in "atomic mass units" or amu. The atomic weight is expressed in grams per mole (g/mol) and is the weighted average of all the isotopes weighted by their abundance.See the Web Links for more information about atomic mass and atomic weight.
What are the four element that have atomic number less than 8?
There are seven elements with atomic number less than 8: hydrogen, helium, lithium, beryllium, boron, carbon, and nitrogen. I don't know where you got the notion that there were only four. I thought you might be thinking of atomic mass instead, but that doesn't work either ... there are only 3 elements that have stable isotopes with a mass below 8 amu (hydrogen, helium, and lithium). 7Be exists, but it's radioactive.
What do you get when you combine 3 neons?
Neon is chemically inert and does not combine with other elements (including itself). It exists as a mono atomic gas.
Why is co placed before ni on the periodic table?
Keep in mind that the atomic mass of an element is based on an average of relative abundance of stable isotopes. Nickel has several stable isotopes and Cobalt I believe has only one stable isotope. The weighted average proportionally to the relative abundance of the several Nickel isotopes is less than the average of Cobalt's isotope(s). So basically Though Nickel has a greater atomic number and the trend is for this to correlate with atomic mass because nickel exists in relatively large proportion as a lighter stable isotope Nickels average atomic mass is less than Cobalt's atomic mass. Google about relative abundance and calculating atomic mass to find all sorts of interesting things!
The element boron has only two stable isotopes one stable isotope has a mass number of 10 and the other has a number of 11. what could be the atomic weight of the element?
From what I remember of chemistry, the amu of each element on the periodic chart is a weighted average of all the isotopes of that element. So, as you indicated - 80.2% of Boron exists as B-11 and 19.8% of boron exists as some other isotope. In that case you can get an estimate of the amu of the unknown through simple math: 0.802*(11.01 amu) + 0.198*(X amu) = 10.81 Solving for x, you get 10.00 amu
