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Relationship between atomic mass and equivalent mass of an element is:
A.Equivalent Mass = \[\dfrac{\text{Atomic Mass}}{{Valency}}\]
B.Atomic Mass = \[\dfrac{\text{Equivalent Mass}}{{Valency}}\]
C.Valency = \[\dfrac{\text{Equivalent Mass}}{\text{Atomic Mass}}\]
D.Atomic Mass = \[\dfrac{{Valency}}{\text{Equivalent Mass}}\]

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Last updated date: 24th Jul 2024
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Answer
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Hint: An element is a substance whose atoms all have the same number of protons; another way to put it is that all of the atoms in a given element have the same atomic number. Chemically, elements are the most basic compounds and hence cannot be broken down by chemical reactions.

Complete answer:
The atomic mass of an element is a weighted average of all its isotopes, where the mass of each isotope is multiplied by the abundance of that isotope. (Atomic mass is also known as atomic weight, but "mass" is a more accurate term.)
The mass number is the sum of the number of protons and neutrons in the nucleus of any given isotope. This is due to the fact that each proton and neutron have the same atomic mass unit (amu). The mass of an atom can be calculated by adding the sum of protons and neutrons and multiplying by 1 amu.
In chemistry, an element's valence or valency is a measure of its ability to combine with other atoms to form chemical compounds or molecules. The combining force of an entity is known as valency. The valency of elements in the same group in the periodic table is the same. The number of electrons in an element's outer shell determines its valency.
The equivalent weight of an element is its gram atomic weight divided by its valence (combining power). The mass of one counterpart, that is, the mass of a given substance that can blend with or displace a fixed quantity of another substance, is known as equivalent weight. The density of an element that mixes with or displaces 1.008 grams of hydrogen, 8.0 gram of oxygen, or 35.5 grams of chlorine is its equivalent weight.
Hence, option A is correct
Equivalent Mass = \[\dfrac{\text{Atomic Mass}}{{Valency}}\]

Note:
The mass of one equivalent, that is, the mass of a given substance that can combine with or displace a fixed quantity of another substance, is known as equivalent weight. Chemically, elements are the most basic compounds and hence cannot be broken down by chemical reactions.