increasing order of Ip2, of following
s, ca,cr ,Fe, Ni, sr, Mo
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The value is second IE generally increases towards the right in period, however Cr
+
has 3d
5
configuration which is extra-stable.
Hence 2
nd
IE of Cr is more than that of Mn. Thus correct order of 2
nd
IE is Cr>Mn>V>Ti
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