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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
An element $X$ has $5$ electrons in its $M-$shell. What is its atomic number$?$
✓

Answer

If the element has $5$ electrons in the $M$ shell, it is in the $3rd$ period of Periodic Table and $15th$ group.
The element in $3rd$ period and $15th$ group is Phosphorous.
Hence $"X"$ is Phosphorous $(P).$

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