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Distinguish between atomic number and mass number with an example. |
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Answer» Solution :Atomic number and mass number : The number of protons present inside the nucleus is called atomic number . It is EQUAL to the number of ELECTRONS in a neutral atom . The ELEMENTS are characterized by their atomic numbers . Atomicnumber is denoted by Z. Example :Insodium , Z = 11 , MEANS that an atom of sodium contains 11 protons in the nucleus and 11 electrons outside the nucleus. Mass number : Mass number indicates the sum of protons and neutrons present inside the nucleus. it isdenoted by A. Example : In sodium, Z = 11 , A= 23 , indicates that an atom of sodium contains 11 proton and (23 -11 ) = 12 neutrons. |
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