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Structure of the Atom — Science STD 9 — Question

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