Question

The K, L, and Mshells of an atom are full. Its atomic number will be 20. Do you agree
with this answer? Explain the reason for your answer.
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Answer 1

this statement statement is incorrect because in first cell the number of atoms is to end in second shell the number of atoms are 8 and the same at third shell but the sum of all the atoms are 18 but it is given that the atomic number is 20 so this statement is impossible and it is incorrect