Why atomic mass of an atom is defined as relative atomic mass•••
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atomic mass of an atom is defined as relative atomic atomic because the mass of any atom is compared with 1/12 of the mass of 1 carbon atom and thus known as atomic mass. hope it helps. plzz mark me as brainlist..
A relative atomic mass (also called atomic weight; symbol: Ar) is a measure of how heavy atoms are. It is the ratio of the average mass per atom of an element from a given sample to 1/12 the mass of a carbon-12 atom. In other words, a relative atomic mass tells you the number of times an average atom of an element from a given sample is heavier than one-twelfth of an atom of carbon-12. The word relative in relative atomic mass refers to this scaling relative to carbon-12. Relative atomic mass values are ratio:1 relative atomic mass is a dimensionless quantity. Relative atomic mass is the same as atomic weight, which is the older term.
The number of protons an atom has determines what element it is. However, most elements in nature consist of atoms with different numbers of neutrons.:17 An atom of an element with a certain number of neutrons is called an isotope. For example, the element thallium has two common isotopes: thallium-203 and thallium-205. Both isotopes of thallium have 81 protons, but thallium-205 has 124 neutrons, 2 more than thallium-203, which has 122. Each isotope has its own mass, called its isotopic mass. A relative isotopic mass is the mass of an isotope relative to 1/12 the mass of a carbon-12 atom. The relative isotopic mass of an isotope is roughly the same as its mass number, which is the number of protons and neutrons in the nucleus. Like relative atomic mass values, relative isotopic mass values are ratios with no units.
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