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4. STRUCTURE OF THE ATOM
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उदाहरण के साथ व्याख्या कीजिए- परमाणु संख्या, द्रव्यमान संख्या, समस्थानिकों के कोई दो उपयोग लिखिए।
Option A
Option B
Option C
Option D
Solution
$(i)$ Atomic number: The atomic number of an element is the total number of protons present in the atom of that element. For example, nitrogen has $7$ protons in its atom. Thus, the atomic number of nitrogen is $7$.
$(ii)$ Mass number: The mass number of an element is the sum of the number of protons and neutrons present in the atom of that element. For example, the atom of boron has $5$ protons and $6$ neutrons. So, the mass number of boron is $5+6=11$.
Standard 9
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