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If it is an element, it could be either chromium (Cr) or molybdenum (Mo). You need to know more to know which. The electronic configuration for Cr is:
[Ar]3d54s1
and for Mo it is
[Kr]4d55s1
So both elements have 5 d-electrons and 1 s-electron. I'm not sure if that what you mean however by "s1d5"...
What else can I help you with?
What is the iron 2 ion and how does it differ from iron 3 ion?
The iron (II) ion, or Fe2+, has a +2 charge due to the loss of 2 electrons. Iron (III) ion, or Fe3+, has a +3 charge from losing 3 electrons. The main difference is the number of electrons each ion has lost, which affects their chemical properties and reactivity.
The outer shell of the atoms in Group D?
The outer shell of the atoms in Group D will always be 1 or 2 s orbital electrons. Irregularities occur with Cr where it is s1d5, not s2d4 and in Group 11 metals it is s1d10 not s2d9 so that the d-subshell is complete at Group 11.
