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When it comes to Atomic Mass, each proton and each neutron (they're called nucleons when we talk about them in an atomic nucleus) in the nucleus of an atom add about 1 to the atomic mass. Just as a for instance, most hydrogen has just a proton for a nucleus. But some has a neutron attached to the proton, or, in extremely rare instances, two neutrons. In the case of "regular" hydrogen, its atomic mass is about 1 while hydrogen with a neutron stuck to its proton has an atomic mass of about 2. Atomic mass has to take into account some subtleties as regards atoms. Use the links below to sort it out.
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Is the atomic number and the atomic weight the same?
No, the atomic number is the number of protons and electrons in a given element. The atomic weight is the weighted average of the isotopes in a natural environment.
What is the atomic number for oxygen 15.9994?
The atomic number for any isotope or mixture of isotopes of oxygen is 8.
Atomic mass differnet from the atomic mass number why is that?
The atomic mass is an average, allowing for the relative abundances of different isotopes.
Why does chlorine have fractional atomic mass?
Chlorine naturally occurs with mixed isotopes, and the number is an average of the atomic mass of those isotopes, in the proportion they are present. The isotopes have the same atomic number (protons), but their mass number can be different due to the presence of a different number of neutrons. These atoms of an element having a different number of neutrons are called isotopes.
What is the average atomic mass compared to atomic mass?
The average atomic mass is a weighted average of the masses of all isotopes of an element, taking into account their abundance. The atomic mass listed on the periodic table is the weighted average of all naturally occurring isotopes of the element. So, they are essentially the same thing, with the average atomic mass being a more specific term.
Can explain in terms of isotopes why the relative atomic mass of atomic number 17 is not a whole number?
Mass number is the average of all the naturally occurring isotopes of that element. When calculated, this average is not a whole number.
What is average atomic number?
There is no average atomic number. The atomic number of an element is the number of protons in the nuclei of its atoms. It is a whole and finite number. The elements are arranged in order of increasing atomic number on the periodic table.
Is the atomic number and the atomic weight the same?
No, the atomic number is the number of protons and electrons in a given element. The atomic weight is the weighted average of the isotopes in a natural environment.
What is the atomic number for oxygen 15.9994?
The atomic number for any isotope or mixture of isotopes of oxygen is 8.
How is average weight of atomic mass computed?
the average atomic mass is computed by summing all isotopic weights of the isotopes of that element and then dividing this by the the total number of isotopes of that element (note that isotopic mass is exactly the same as atomic weight, except for isotopes).
Where does average atomic mass come from?
The mass of an atom derives mostly from the mass of the protons and neutrons in its nucleus. It is slightly less that their total number since some of the mass is converted into energy that holds the nucleus together. Electrons have a negligible effect on atomic mass.Elements can exist in the form of a number of isotopes: these are atoms which differ in the number of neutrons that they contain. The average atomic mass is the average of the atomic masses of all the isotopes of an element, weighted according to the abundance of the isotope.
Atomic mass differnet from the atomic mass number why is that?
The atomic mass is an average, allowing for the relative abundances of different isotopes.
Why does chlorine have fractional atomic mass?
Chlorine naturally occurs with mixed isotopes, and the number is an average of the atomic mass of those isotopes, in the proportion they are present. The isotopes have the same atomic number (protons), but their mass number can be different due to the presence of a different number of neutrons. These atoms of an element having a different number of neutrons are called isotopes.
What is the difference between an elements atomic mass and its number?
The atomic number is the number of protons or, equivalently, the number of electrons. The Atomic Mass also includes the neutrons. Furthermore, the atomic mass is an average of the isotopes of the element weighted according to their abundance.
What is the average atomic mass compared to atomic mass?
The average atomic mass is a weighted average of the masses of all isotopes of an element, taking into account their abundance. The atomic mass listed on the periodic table is the weighted average of all naturally occurring isotopes of the element. So, they are essentially the same thing, with the average atomic mass being a more specific term.
How can the atomic mass of the element be lower than the element that came before it?
Because the periodic table is organized by atomic number, not by atomic mass. The general trend in the periodic table is a higher atomic mass as you go up atomic number, but there are exceptions.
What atoms with same atomic number but different atomic masses?
Isotopes are atoms with the same number of protons (same atomic number) but different numbers of neutrons, leading to different atomic masses. For example, carbon-12 and carbon-14 are isotopes of carbon with atomic number 6 but atomic masses of 12 and 14 respectively.
