Here's why:

* Cr represents Chromium.

* P represents Phosphorus.

* The Roman numeral (I) indicates that chromium has a +1 oxidation state in this compound.

It's important to note that Chromium(I) Phosphide is a hypothetical compound. While chromium can form various compounds with phosphorus, a +1 oxidation state for chromium is uncommon and this specific compound has not been experimentally confirmed.