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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom2 Marks
Question
If $Z = 3,$ what would be the valency of the element? Also, name the element.
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Answer

By $Z = 3$, we mean that the atomic number of the element is $3$. Its electronic configuration is $2, 1$. Hence, the valency of the element is $1$ (since the outermost shell has only one electron). Therefore, the element with $Z = 3$ is lithium.

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