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State the name and the mass of the isotope relative to which all atomic masses are measured?
Wiki User
∙ 15y ago
Carbon-12 is used as the standard by which the atomic masses of other nuclides are measured.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoCarbone / 12
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Relative atomic masses are measured in?
Atomic mass is measured in a unit called an "atomic mass unit". This unit is defined as 1/12 of the mass of a carbon-12 atom at ground state.An atomic mass unit is approximately 1.66053886 x 10-27 kg.Atomic mass is measured in atomic mass units (amu) and Daltons.
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)
Who was The first attempt at publishing a list of relative atomic masses?
John Dalton tried to work out the relative masses of atoms; but his calculations were wrong, although the principle was correct. He was, however, the first to establish a table of atomic masses with hydrogen, the lightest atom, as the standard.
Is the atomic mass equal to the number of atoms in the elements?
The mass number of an isotope of an element is equal to its atomic mass number. However, the atomic weight of an element is a weighted average of the isotopes that occur in the element in nature. Because almost all elements have more than one naturally occurring isotope (if they have any), the atomic weights of most elements are not integers, as mass numbers always are.
What number represents the mass number?
The mass number indicates the sum of the number of protons and neutrons of the isotope. The mass number, nucleon number or atomic mass indicated about the respective chemical symbols in the periodic table are average figures based on the different isotopes and their relative abundance. That is why there are decimals in mass numbers in the periodic table. It can be used to compare the relative atomic masses of different atoms.
Why are gram formula masses called relative masses?
They are called relative masses because all of the masses of the elements are measured relative to the mass of an isotope of carbon called carbon-12. Carbon-12 has been assigned a mass of exactly 12 atomic mass units. One atomic mass unit has an actual value of 1.660538782(83)×10^−27 kg.
True or false relative atomic masses sre measured in amus?
true
What are the units for average relative atomic masses?
The unit is such that the isotope Carbon 12 is exactly 12 by definition.
Is this statement true or false The isotope hydrogen-1 is the standard used for the relative scale of atomic masses?
true
What nuclide is used as standard relative scale for atomic masses?
12 grams of carbon-12 isotope.
How you calculate the relative atomic weight of uranium?
The atomic weight of an element is derived from the atomic masses of the isotopes of this element and from the percentage of these isotopes. The correct terms are: - atomic weight for elements - atomic mass for an isotope
How isotopes can be deduce the fractional atomic masses of elements from the relative isotopic abundance?
The relationship between atomic mass and relative abundance of isotopes was the mas number is the number of protons and neutrons in a normal atom of the element and tha atomic mass is the actual mass of the atom, measured in grams.
What is an isotope and why are atomic masses usually in decimal form?
An isotope is a variant of the atom with the same number of protons but more or fewer neutrons. The atomic mass is an average of the isotopes of the element. The average is weighted according to the relative abundance of such isotopes.
What is the average atomic mass of an element is the average atomic masses of what kind of isotopes?
average atomic massof an element=(Atomic mass of first isotope X % of that isotope) + (Atomic mass of second isotope X % of the second isotope)
What is an element that has the same chemical properties but different atomic masses?
an isotope
The atomic mass of an element depends upon the?
1. atomic number and the ratios of its naturally occurring isotopes.2. atomic number and the half-lives of each of its isotopes.3. masses and the ratios of its naturally occurring isotopes.4. masses and the half-lives of each of its isotopes.answer: 3. masses and the ratios of its naturally occurring isotopes.
Is atomic masses measured in amus?
Yes it is true.
