We’re asked to find the number of outer-shell d electrons in each of the 4 transition metal ions shown.
For this, we need to find the total number of electrons in the atom and write the condensed configuration using the noble gas notation.
First, remember that the number of electrons in a neutral atom equals the number of protons, which equals the atomic number.
So, we assign the atomic number of each element as the total number of electrons in a neutral state:
Re (75 electrons)
Sc (21 electrons)
Ru (44 electrons)
Hg (80 electrons)
How many outer-shell d electrons are there in each of the following transition-metal ions?
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