Select the atoms whose ions have an electron configuration of nd5(n = 3, 4, 5 for example, the 2+ ion for v ends the electron configuration with 3d 3.
ir
rn
fe
pa
y
re

The atoms whose ions have electronic configuration as are Iridium (Ir), Iron (Fe) and Rhenium (Re)

Explanation:

An ion is formed when a neutral atom looses or gains electrons.

For the given elements:

Iridium:  The electronic configuration of this element is . The stable oxidation state of iridium is +4.

The electronic configuration of is

Radon:  The electronic configuration of this element is . This is a stable element.

Iron:  The electronic configuration of this element is . The stable oxidation state of iron is +3.

The electronic configuration of is

Protactinium:  The electronic configuration of this element is . The stable oxidation state of protactinium is +3.

The electronic configuration of is

Ytterium:  The electronic configuration of this element is . The stable oxidation state of ytterium is +3.

The electronic configuration of is

Rhenium:  The electronic configuration of this element is . The stable oxidation state of rhenium is +2.

The electronic configuration of is

Hence, the atoms whose ions have electronic configuration as are Iridium (Ir), Iron (Fe) and Rhenium (Re)

1. they vary with a higher number because boiling is way hotter than melting