What information do you get from the figure about the atomic number,mass number,and valency of atoms $X$,$Y$,and $Z$? Give your answer in a tabular form.
(N/A) The atomic number is equal to the number of protons. The mass number is the sum of protons and neutrons. The valency is determined by the number of electrons in the outermost shell (valence shell).
| Atom | Atomic No. | Mass No. | Valency |
|---|---|---|---|
| $X$ | $5$ | $11$ | $3$ |
| $Y$ | $8$ | $18$ | $2$ |
| $Z$ | $15$ | $31$ | $3$ |
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