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Q.
Compared with an atom of atomic weight $12$ and atomic number $6$ , the atom of atomic weight $13$ and atomic number $6$ .
Structure of Atom
Solution:
$_{6}A^{12}$ and $_{6}X^{13}$ both are isotopes but have different no. of neutrons.
$_{6}A^{12}, $A have $p = 6, e = 6$ and $n = 6$ and
$_{6}X^{13},$ X have $p = 6 ,e = 6$ and $n = 7$