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What is the standard for comparison for the relative masses listed n the periodic table?
Wiki User
∙ 14y ago
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.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThe relative atomic mass of an atom is a comparison of the mass of that element with a certain reference(i.e 1/12 of the mass of a carbon-12 atom),and hence the word relative.For eg. When i say the relative atomic mass of oxygen atom is 18 (notice no units),that implies it is 18 times heavier than 1/12 of the mass of a carbon -12 atom.There are no units because we are taking the ratio,i.e relative to each other,so the unit cancells out.
It is required to relate masses from the atomic world which are of extremely small order(say 10^-34!!) to our world(in normal grams or kgs)
Also the mass of 1/12 of a carbon 12 atom was chosen because it gave simpler whole number ratios when divided with the mass of other atoms.The mass of a 1/12 of a carbon 12 atom was measured by a spectroscope,and it equals 1.6605×10^−27 kg.
Wiki User
∙ 10y agoIt is possible to compare the mass of one element to other elements, based on the average mass of the existing isotopes as found in nature, or, to compare the mass of one isotope to another isotope. For example, the lightest and most common isotope of hydrogen, which we can call hydrogen one (which has one proton in its nucleus and no neutrons), weighs only one quarter as much as the most usual isotope of helium, helium four (which has two protons and two neutrons in its nucleus). To get the atomic weight of an element, based on average isotopic weights, you need only consult the periodic table of elements.
Wiki User
∙ 11y agoIt is in the top right corner of the box the chemical symbol is in. it means that it is the mass of the chemical in grams.
Wiki User
∙ 15y agoIf you mean 'What does Mass number mean on the periodic table?' Mass number shows how many Protons and Neutrons are in the Atom.
Wiki User
∙ 12y agoThe amount of protons in an element.
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Mohamed Purdy
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∙ 11y agoatom
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What on the periodic table metals are listed on the?
On the periodic table metals are listed on the left side.
What information is listed on an element on the periodic table?
The information like element symbol and its atomic number are listed on a element in periodic table.
How many elements are listed in periodic table?
There are 53 Elements in the Periodic Table.
Why the relative atomic numbers of some elements are not shown in the periodic table?
All known elements are listed on the periodic table of the elements. Historical tables did not have elements listed that were unknown at the time. For instance, Dimitri Mendeleev, who laid out the first successful periodic table in 1869, did not have any of the noble gases listed since none of them had been discovered at that time. Modern periodic tables have gaps at the lower right end where elements are expected to be created in labs in the future, but have not been successfully created yet.
Are elements listed in the periodic table?
Yes, they are.
What element has a relative atomic mass of 15.5?
Relative atomic mass, also called atomic weight, is listed on the periodic table for each element. There is no element listed on the periodic table with a relative atomic mass of 15.5.
What mass is listed in the periodic table?
Atomic weight, which is the mean relative mass and is dimensionless.
Elements that are listed on the periodic table are in their natural phase of matter at what temperature?
The standard temperature after IUPAC is 0 oC.
What on the periodic table metals are listed on the?
On the periodic table metals are listed on the left side.
Why are uranium and arsenic listed in the periodic table?
Uranium and arsenic are listed in the periodic table because they are elements.
What does the word periodic refer to?
like as in the periodic table of how it is listed.
Where are all the elements on earth listed?
The periodic table.
What is listed on the periodic table?
The element
What information is listed on an element on the periodic table?
The information like element symbol and its atomic number are listed on a element in periodic table.
How many elements are listed in periodic table?
There are 53 Elements in the Periodic Table.
What is the number listed for each element on the periodic table?
The number listed above the symbol of an element on the periodic table is the element's atomic number.
Where are the nonmetals listed on a periodic table?
Non metals are listed on right side in periodic table. They belong to group numbers 15,16, and 17
