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Many atoms exist in the form of different isotopes. These have different numbers of neutrons and so their atomic masses are different. The Atomic Mass for the element is the average of these masses, weighted together according to their abundance.
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Which value is used to arrange the elements in the periodic table?
atomic weight
What does Increase Decimal mean in Excel?
It mean to add more decimal places to a value. Sometimes this will show a more accurate value, rather than a rounded up value which is being shown because there are not enough decimal places to show the value in full.
What is the value that depends on the distribution of the elements isotopes in nature and the masses of those isotopes?
This value is the atomic weight.
Why do some elements not have relative atomic masses eg. radium?
All the elements has an atomic weight; sometimes for the unstable radioactive elements is indicated only the value of the atomic mass of the most stable isotope.The term atomic weight is used for elements and the term atomic mass for isotopes (after the rules and the tradition of IUPAC).
The atomic mass of the elements are not whole value numbers because of the existence of?
D. Protons
Why do atomic mass numbers have decimals for oxygen?
The mass number is the sum of protons and neutrons in the atomic nucleus of chemical elements. All mass numbers are integers. The atomic weight is not an an integer because is calculated taking in the account the isotopic composition of an element; also the mass excess has a role.
How chemists know the atomic masses of elements in the periodic table?
Chemists determine the atomic masses of elements by analyzing the isotopic composition of the element in nature. They calculate the weighted average of the masses of each isotope present, taking into account their relative abundance. This average atomic mass is the value listed in the periodic table.
How is the mass number different from the average atomic mass?
The mass number is the total number of protons and neutrons in an atom's nucleus, while the average atomic mass is the weighted average of the masses of all isotopes of an element based on their abundance in nature. The mass number is a whole number, while the atomic mass is a decimal value.
Why isn't the atomic mass of most of the elements on the periodic table an integer and not a decimal?
The atomic mass of an element is not always an integer because it considers the average mass of all isotopes of that element, taking into account their abundance. Since isotopes have different masses, the weighted average can result in a non-integer value. Additionally, the presence of isotopes with different masses means that the atomic mass is a weighted average influenced by the abundance of each isotope.
The atomic weight scale is based upon international agreement that?
the atomic weight scale is based upon the relative atomic masses of elements compared to carbon-12, which has an assigned value of 12. This standardization allows for consistency and accuracy in comparing the masses of different elements.
What was Dmitri Mendeleev able to do show the value of his contribution?
Dmitri Mendeleev was able to demonstrate the value of his contribution to chemistry by accurately predicting the properties of undiscovered elements and leaving gaps in his periodic table for them, which were later filled by their discovery. This validated the organization of elements by atomic number and helped establish the periodic law.
When Mendeleev published his periodic table there were some spaces for undiscovered elements Figure 15-1 is a section of a similar table A reasonable value for the atomic mass of the missing element?
A reasonable value for the atomic mass of the missing element can be estimated by finding the average atomic mass of the elements on either side of the missing element in the periodic table. This estimation assumes a gradual increase in atomic mass across the periods in the table.
