Multiple choice

Ca3P2

  1. tricalcium diphosphide

  2. calcium (II) phosphide

  3. calcium phosphide

  4. calcium (III) phosphide

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ca3P2 is an ionic compound. Since calcium always forms a 2+ ion, we do not need Roman numerals in the name. It is simply calcium phosphide.