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The Periodic Table — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYThe Periodic Table1 Mark
Question
An element $A$ has $2$ electrons in its fourth shell. State:
its electronic configuration
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Answer

Its electronic configuration is $1s^22s^22p^63s^23p^64s^2.$

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