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so the mass of an atom is determined by the number of protons and neutrons in an element. For a given element, the number of protons is the same but the number of neutrons can vary (an element can have various isotopes). Therefore, the average Atomic Mass of an element is simply a weighted average of the masses of all the isotopes of that element.
(a weighted average means that how common an isotope is is taken into account when incorporating it into the average, so rare isotopes will not count as much as common isotopes)
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∙ 12y ago
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∙ 8y agothe mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
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∙ 11y agoAtomic mass is the mass of a neutral isotope expressed in unified atomic units - this unit is equal to 1/12 of the atomic mass of the isotope carbon-12.
A frequent error is the confusion between atomic mass (for isotopes) and atomic weight (for elements).
Wiki User
∙ 6y agoThe mass of the carbon atom with six protons and six neutrons is taken as twelve. Then the average mass of the elements is calculated accordingly. You have different isotopes of the elements due to different number of neutrons. The proportion of the isotopes vary as per the element. So the average comes in fraction. Like the average mass of the fluorine is 18.998. The mass of the carbon itself is 12.011.
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∙ 12y agoThe weighted average of the atomic masses of the naturally occurring isotopes of an element.
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∙ 6y agoIt means that you take the average over different atoms. Note that for one and the same element, different atoms can have different masses, due to the different number of protons.
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∙ 14y agogjhgkgkg
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What is one twelfth of the mass of the carbon 12 atom?
the answer is the atomic mass unit
What describes the definition for the atomic mass of an element?
the atomic mass is the mass of an atomin the table of elements each element has its own specific box. the atomic mass is listed under the elemnts symbolEX. 2HE4.00
How many gram does one mole of helium gas weighs?
By definition, one mole would be the same as the atomic mass. You take the number of moles and multiply it by the atomic mass (divide by one mole for units to cancel). So if you have just 1 mole, the number of grams will be the atomic mass. Helium's atomic mass is 4.003 grams.
By definition one atomic mass unit is defined as 1 12 of the mass of a?
A. carbon -12 atom
How many moles are in 5.87 g Ni?
By definition, one mole would be the same as the atomic mass. You take the number of moles and multiply it by the atomic mass. So if you have just 1 mole, the number of grams will be the atomic mass. Nitrogen's atomic mass is 14.007 grams.
What is one twelfth of the mass of the carbon 12 atom?
the answer is the atomic mass unit
What is the AMU of carbon?
AMU stands for atomic mass units; the number of units an element has is called its atomic mass. The atomic mass of carbon is exactly 12, by definition.
What is the best definition for the term amu?
Atomic Mass Units.atomic mass unit
What describes the definition for the atomic mass of an element?
the atomic mass is the mass of an atomin the table of elements each element has its own specific box. the atomic mass is listed under the elemnts symbolEX. 2HE4.00
How many atomic mass units are there in carbon-12?
12 by definition.
What is Carbon-12 atomic mass?
12. The number 12 refers to the atomic mass. More precisely, to the sum of neutrons + protons; but this is usually close to the atomic mass. In the case of carbon-12, it is exact, by definition.
How many gram does one mole of helium gas weighs?
By definition, one mole would be the same as the atomic mass. You take the number of moles and multiply it by the atomic mass (divide by one mole for units to cancel). So if you have just 1 mole, the number of grams will be the atomic mass. Helium's atomic mass is 4.003 grams.
By definition one atomic mass unit is defined as 1 12 of the mass of a?
A. carbon -12 atom
What is the definition of hyphen notation?
Element - Atomic Mass # Example: Carbon - 12
How many moles are in 5.87 g Ni?
By definition, one mole would be the same as the atomic mass. You take the number of moles and multiply it by the atomic mass. So if you have just 1 mole, the number of grams will be the atomic mass. Nitrogen's atomic mass is 14.007 grams.
How come the relative atomic mass can be a fraction?
The relative atomic mass is the mean mass of the isotopes of an element. Since, by definition, these have different numbers of neutrons, their masses are different. This results in fractional values.
What is atomic mass unit and how is it derived?
1 atomic mass unit is equivalent to the 1/12 the mass of a carbon-12 atom at rest. This is not considered an si unit because it is defined by a definition and not experimentally
