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Atomic mass is not the same as atomic weight.
It refers to the weight in amu (atomic mass units ) of a specific isotope. These weights are not whole numbers, the mass of protons and neutrons are slightly different and there is the phenomenon of binding energy of the nucleus which is obseved as a difference in mass (sometimes expressed as the packing fraction).
For atomic weights the main reason is that naturally occuring elements consist of mixtures of isotopes.
No, the atomic masses of elements are not fractional. Atomic masses are usually expressed using the unified Atomic Mass unit (u), which is defined based on the carbon-12 isotope. For most elements, the atomic mass is a whole number since it is the weighted average of the masses of the naturally occurring isotopes of that element.
Yes, because some elements have more than one stable isotope. The isotopes individually have integral numbers of atomic mass units, but the value for the element is the average of the mass of all the naturally occurring isotopes, weighted by their relative abundances in nature, and this average is often fractional. Chlorine, for example, has isotopes of mass numbers 35 and 37, and the elemental atomic mass of about 35.5 indicates that the lower mass isotope is about three times more common than the higher mass one.
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When masses combine to form elements with larger masses?
Atomic fusion occurs when masses combine to form elements with larger mass.
What elements have such small masses that they are not even considered when atomic masses are calculated?
Electrons
Why some elements possess fractional atomic mass?
It is mostly because elements have many isotopes and their average comes to be also fractional.We cannot weigh the atom therefore its atomic mass is fractional.Even elements with only 1 naturally occurring isotope have fractional mass. This is because the nuclear binding energy is a very large (negative) energy, and it shows up in the atomic mass because of the relativistic adjustment that has to be made --E= mc2,
Where was mendeleev's strategy for classifying elements was modeled on?
Atomic Masses
Name the elements whose atomic masses corrected by mendeleev?
The atomic masses corrected by Mendeleev are those of beryllium, indium, and uranium. Mendeleev was able to accurately predict the properties of these elements based on their corrected atomic masses.
What did Dimitri Mendeleeve do?
Dmitri arranged the elements in order of increasing atomic masses. He arranged elements in rows and columns according to atomic masses.
When masses combine to form elements with larger masses?
Atomic fusion occurs when masses combine to form elements with larger mass.
What elements have such small masses that they are not even considered when atomic masses are calculated?
Electrons
Do all elements have different atomic masses?
yes
Why aren't atomic masses of elements not whole numbers?
because of its no. in table of elements
Why are most atomic masses a decimal?
The atomic mass of an isotope of an element is the mass of the nucleons (neutrons + protons) in an atom of that isotope. This is nearly, though not exactly, equal to the number of nucleons, and so is nearly a whole number.The main cause for the atomic mass being fractional is that most elements have numerous isotopes, each with a different number of neutrons and so a different atomic mass. The atomic mass for an element is the average of the atomic masses of all its isotopes, weighted together in the proportion of the isotopes' abundance on earth. It is this weighting together that results in the numbers being fractional.
Why some elements possess fractional atomic mass?
It is mostly because elements have many isotopes and their average comes to be also fractional.We cannot weigh the atom therefore its atomic mass is fractional.Even elements with only 1 naturally occurring isotope have fractional mass. This is because the nuclear binding energy is a very large (negative) energy, and it shows up in the atomic mass because of the relativistic adjustment that has to be made --E= mc2,
What neighboring elements have atomic masses out of order?
Tellurium and Iodine
What two elements have the smallest atomic masses?
hydrogen and lithium
Where was mendeleev's strategy for classifying elements was modeled on?
Atomic Masses
Name the elements whose atomic masses corrected by mendeleev?
The atomic masses corrected by Mendeleev are those of beryllium, indium, and uranium. Mendeleev was able to accurately predict the properties of these elements based on their corrected atomic masses.
How were the atomic number and the atomic masses of the elements determined?
Atomic masses are determined by mass spectrometry. The atomic number is identic with the number of protons in the atom - depends on position in the periodic table.
