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The various atomic weights of the same element are called?
Atoms of the same element with different atomic masses are known as isotopes. Isotopes differ only by the number of neutrons present in the nucleus of the isotopes. The number of protons is the same for all isotopes of an element (because if there were different numbers of protons, then the atoms would not be of the same element).
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.
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 are the masses on the periodic table mostly not 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. Note: no atomic masses for elements but atomic weights is correct.
Which sub atomic particles cause isotopes to appear?
Isotopes are caused by variations in the number of neutrons in an atom's nucleus. Neutrons are subatomic particles that do not carry an electric charge and contribute to an atom's mass. The different number of neutrons in isotopes result in variations in atomic mass.
What would cause the average atomic mass to be close to a whole number?
The average atomic mass of an element is close to a whole number when the element has nearly equal amounts of its isotopes, with atomic masses that are close to whole numbers themselves. This occurs in elements with only one stable isotope or with stable isotopes that have similar abundances.
Why are atomic masses of elements usually not whole numbers?
The atomic mass listed in the periodic is found by taking the average of all the different isotopes of a given element found in nature, weighted for their natural abundance.Note that the atomic mass is not the same as the atomic weight. The atomic mass is the weight of one specific isotope of one atom, and is expressed in "atomic mass units" or amu. The atomic weight is expressed in grams per mole (g/mol) and is the weighted average of all the isotopes weighted by their abundance.See the Web Links for more information about atomic mass and atomic weight.
Why are the masses of the elements on the periodic table a decimal number?
The decimal is the average atomic mass of an element. Each element has a set of isotopes which have different numbers of neutrons and therefore different atomic masses. For example there are 3 isotopes of carbon. with masses of 12, 13 and 14, though carbon-12 is the most common by far. But because of the two heavier isotopes the average mass is 12.011 rather than just 12.
What is the weighed average mass of an atom of an element?
The weighted average mass of an atom of an element is determined by considering the mass of each isotope and its relative abundance. This mass is often found on the periodic table as the atomic mass or atomic weight, which takes into account the masses and abundances of all naturally occurring isotopes of that element.
Why is the atomic mass found on the periodic table not a whole number?
Two reasons. Firstly, the masses listed in the table are usually averages. Carbon naturally comes mainly in two reasonably common and one considerably less common types: carbon-12 (about 99%), carbon-13 (about 1%), and carbon-14 (tiny amounts). If you choose a bunch of carbon atoms at random and measure their masses, you'll get an average that's a little bit higher than 12 (specifically, something close to 12.011). The same is true for most other elements as well. Secondly, except for carbon-12 (which is the standard and by definition has a mass of 12 amu exactly), the actual masses of atoms aren't whole numbers. The binding energy holding the nucleus together throws the total off slightly from what you would expect, due to energy-mass equivalence (E=mc2).
What are the radioactive isotopes?
radioactive isotopes are isotopes with irregular nuclear composition, it emits energy due to decay of atomic nucleus.
