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the Atomic Mass
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Why aren't the atomic masses of most elements whole numbers?
The atomic masses of most elements are not whole numbers because they take into account the average mass of all the isotopes of that element, which have different masses due to varying numbers of neutrons. This results in a weighted average that is not a whole number.
Do Isotopes of uranium have different atomic numbers?
No. By definition isotopes of an element have the same number of protons (that is what makes them uranium, for example) but different numbers of neutrons (neutral particules in the nucleus which provide mass).
How are isotopes related to atomic masses not being whole numbers?
Atomic masses are the weighted average of all the isotopes of an element. The average is based on the relative abundance of each isotope. Let say we have an element with two isotopes, the first isotope has a mass of 6 and the second has a mass of 8. If we took a straight average of the atomic masses then the element would have a mass of 7. But a weighted average based on the abundance of each isotope would be different (unless both isotopes are found to be in equal amounts ie. both 50% abundance) If the isotope with a mass of 6 had a relative abundance of 75% (meaning that 3/4 of all atoms of that element had a mass of 6) then the other isotope would have a relative abundance of 25% (relative abundance must add up to 100%). The atomic mass of the elements would be calculated by multiplying each isotopes mass my the relative abundance and then adding the two results together. 75% (6) = 4.5 25% (8) = 2.0 4.5 + 2.0 = 6.5 The atomic mass for this element would have an atomic mass of 6.5 amu (atomic mass units)
What is the atom with same atomic number but different mass 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.
Why does bromine have different mass numbers?
Different isotopes of bromine have different numbers of neutrons, resulting in different mass numbers. Bromine-79 and bromine-81 are the two most common isotopes of bromine, with mass numbers of 79 and 81, respectively.
What is the average of the mass numbers of an elements isotopes?
the Atomic Mass
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 the mass numbers on the periodic table of elements are rarely whole numbers?
Elements also possess isotopes. So their average atomic mass is rarely whole number.
What is the mass number of sliver?
Mass number is a property of isotopes, not elements themselves. Naturally occurring silver is a mixture of isotopes with mass numbers 107 and 109, with an average atomic mass of 107.9.
What is the average of the mass numbers of isotopes of an element?
the atomic mass
Why elements don't have whole numbers?
do you mean the why is the average atomic mass not a whole number? because if that is your question, then the answer is that each element has multipal isotopes and the mass you see on the periodic table is the average of all the isotopes together. So there has to be a decimal on the periodic table of elements
What is the average mass of the isotope of an element?
the average mass numbers of the isotopes of an element
Name two elements have the same mass numbers?
No elements have the same average mass, but some isotopes are the same mass as other elements, For example Carbon-13 (an isotope of carbon) has the same mass as nitrogen-13 (which is also an isotope of nitrogen).
What do elements of isotopes have differently?
Because of the difference in mass number. Isotopes must have different numbers of neutrons.
What isotopes of uncharded elements have different numbers?
The atomic number of the isotopes of an element is identical; the mass number is different.
Why is the atomic mass of an element an average?
The atomic mass is an average because most elements consist of a mixture of isotopes.
What are the atomic mass of elements rarely whole numbers?
1. First cause: the atomic weight is the sum of the weights of protons, neutrons ans electrons.; they don't have masses as integers.2. Second cause: also occurs the so-called mass defect.Not atomic mass for elements; atomic weight is correct.
