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What information do you get from the following electronic distribution about the atomic number, mass number and valency of atoms $X, Y$ and $Z$ ? Give your answer in a tabular form.
- In atom $X$, valency is equal to number of valence electrons $(2,3)=3$
- Atom Y has electronic configuration 2,6 . Valency is eight - No. of valence electrons (8-6)
- In atom Z, valency is equal to number of valence electrons $(2,8,5)$, or eight - no. of valence electrons $(8-5)=3$.