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  4. An element is in M3+ form. Its electronic configuration is [Ar] 4s1 . What is the atomic number of element?

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Q. An element is in $ {{M}^{3+}} $ form. Its electronic configuration is $ [Ar]\,4{{s}^{1}} $ . What is the atomic number of element?

JIPMERJIPMER 2002The d-and f-Block Elements

Solution:

When element is in $ {{M}^{3+}} $ form, its electronic configuration is $ [Ar]\,4{{s}^{1}}, $ hence, electronic configuration of M will be $ [Ar]\,4{{s}^{2}}3{{d}^{2}}. $ Hence, atomic number of element (M) = 18 + 4 = 22.