Question

solve all these questions plz...​

Answer 1

Answer:

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Step-by-step explanation:

We know that : <br> Mass number = Atomic number + No. of neutrons <br> So, 23 = Atomic number + 12 <br> And, Atomic number = 23 - 12 <br> = 11 <br> The element having atomic number 11 is sodium and its symbol is Na. If, however, we indicate the atomic number and mass number also, then the symbol becomes

, where 11 is the atomic number and 23 is the mass number.