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What isotope of carbon has been chosen as the reference isotope for atomic mass units?
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∙ 13y ago
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What isotope of carbon has been chosen as the reference isotope for atomic mass unit?
carbon 12
Why was carbon chosen as the base amu thay could have used any other element?
Carbon was chosen as the base atomic mass unit (amu) because it has a stable isotope, carbon-12, that serves as the reference isotope. Carbon-12 is widely available in nature and has an atomic mass of exactly 12 amu, making it an ideal choice for defining the atomic mass unit. Additionally, carbon is abundant in organic compounds, which are the basis of life on Earth, making it a practical and relevant choice for scientific calculations.
What is the standard for comparison for the relative masses listed n the periodic table?
The standard comparison for atomic weights on the periodic table is carbon 12. This is a common isotope of carbon which has 6 protons and 6 neutrons. Carbon 12 is assigned an atomic mass of 12, and other elements' atomic masses are all relative to this value.
Why was basis of classification of element in the periodic table changed from atomic mass to atomic number?
Mendeleev's periodic table was based on the atomic masses of elements. However, this was not effective when isotopes were discovered. An isotope of an element is defined as the element having the same atomic number but varying mass numbers. So, mass numbers weren't constant and hence, a better characteristic was chosen -atomic number. Atomic number of any element was a characteristic of a particular element. Hence atomic numbers were taken as the basis of classification instead of atomic masses.
Isotopes to calculate atomic mass for zinc?
I have the five isotopes of zinc, each with its percent by mass abundance and the compostition of its nucleus. Now I need to calculate the approximate atomic mass of zinc as I would find it in nature and listed on the periodic table. How do I go about doing this? in the first isotope there are 30p and 34n and the percent mass abundance is 48.89% the second isotope is 30p and 36n and 27.81% third isotope is 30p and 37n 4.11% fourth isotope is 30p and 38n and 18.57% and the fifth isotope has 30p and 40n and 0.62%.Any help anyone can provide I would greatly appreciate!THANKS4 years agoReport AbuseDavidBBest Answer - Chosen by VotersFor each isotope calculate the mass number (# protons + # neutrons) for each atom. This is its approximate atomic mas. Then calculate the average mass for all the isotopes. Covert the percentages to decimals then multiply each mass number by the decimal of the abundance and add all the terms (64 x 0.4889) + (mass # 2 + 0.2781) + (......) + (......) + ( .....)4 years ago
What isotope of carbon has been chosen as the reference isotope for atomic mass unit?
carbon 12
Why was carbon chosen as the base amu thay could have used any other element?
Carbon was chosen as the base atomic mass unit (amu) because it has a stable isotope, carbon-12, that serves as the reference isotope. Carbon-12 is widely available in nature and has an atomic mass of exactly 12 amu, making it an ideal choice for defining the atomic mass unit. Additionally, carbon is abundant in organic compounds, which are the basis of life on Earth, making it a practical and relevant choice for scientific calculations.
What is the standard for comparison for the relative masses listed n the periodic table?
The standard comparison for atomic weights on the periodic table is carbon 12. This is a common isotope of carbon which has 6 protons and 6 neutrons. Carbon 12 is assigned an atomic mass of 12, and other elements' atomic masses are all relative to this value.
Why was basis of classification of element in the periodic table changed from atomic mass to atomic number?
Mendeleev's periodic table was based on the atomic masses of elements. However, this was not effective when isotopes were discovered. An isotope of an element is defined as the element having the same atomic number but varying mass numbers. So, mass numbers weren't constant and hence, a better characteristic was chosen -atomic number. Atomic number of any element was a characteristic of a particular element. Hence atomic numbers were taken as the basis of classification instead of atomic masses.
Isotopes to calculate atomic mass for zinc?
I have the five isotopes of zinc, each with its percent by mass abundance and the compostition of its nucleus. Now I need to calculate the approximate atomic mass of zinc as I would find it in nature and listed on the periodic table. How do I go about doing this? in the first isotope there are 30p and 34n and the percent mass abundance is 48.89% the second isotope is 30p and 36n and 27.81% third isotope is 30p and 37n 4.11% fourth isotope is 30p and 38n and 18.57% and the fifth isotope has 30p and 40n and 0.62%.Any help anyone can provide I would greatly appreciate!THANKS4 years agoReport AbuseDavidBBest Answer - Chosen by VotersFor each isotope calculate the mass number (# protons + # neutrons) for each atom. This is its approximate atomic mas. Then calculate the average mass for all the isotopes. Covert the percentages to decimals then multiply each mass number by the decimal of the abundance and add all the terms (64 x 0.4889) + (mass # 2 + 0.2781) + (......) + (......) + ( .....)4 years ago
Is the trajectory of a moving point does not on the chosen reference?
Yes it is
What is the reference that he was one of the 12 Apostles chosen by Jesus?
St. Mark was not one of the 12 chosen by Jeasus.
Was dropping atomic bombs chosen by the US?
no Kennedy decided
What point must be chosen to determine the motion of an object?
A reference point must be chosen to determine the motion of an object.
The amount of gravitaional potential energy that an object has depends on its weight and?
On the object's weight and height above the chosen reference level (for example, above ground level).On the object's weight and height above the chosen reference level (for example, above ground level).On the object's weight and height above the chosen reference level (for example, above ground level).On the object's weight and height above the chosen reference level (for example, above ground level).
Why do reference points that are stationary are chosen to determine whether an object is in motion?
To help you state how the reference point placement is and how the object is moved from the reference point
Why aren't atomic masses of most elements whole numbers?
There are two reasons:most naturally occurring elements are mixtures of different isotopes of the element, each having a different atomic mass which when the weighted average is calculated would not give whole numbers even if the individual atomic masses were all whole numbersthe Mass Defect caused by the conversion of some of the mass of the protons and neutrons in the nucleus being converted to Binding Energy according to the equation E = M*c^2 which means that no more than one isotope of one element will have a whole number atomic mass which at various times was arbitrarily chosen to be hydrogen-1 (very old), oxygen-16 (old), nitrogen-14 (old), or carbon-12 (current) and new non-whole number atomic masses were recalculated for all other isotopes based on that one whole number atomic mass of the selected isotope.
