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Out of first 100 elements,number of elements having electrons in 3d-orbitals are

$(a)\;80\qquad(b)\;10\qquad(c)\;100\qquad(c)\;60$

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Elements from atomic no 21 to 100,each has 3d-electron in its configuration.
Hence (a) is the correct answer.
answered Jan 10, 2014 by sreemathi.v
 

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