Answer:
10 x 5 = 50
Explanation:
50 is the mass of her chemical.
Chromium has the electron configuration [Ar]4s13d5 and exhibits oxidation numbers 2+, 3+, and 6+. When chromium loses two electrons, it forms the Cr2+ ion and has the configuration [Ar]3d4.
The Answer is B. [Ar]3d4
<u>The addtion of energy</u> <span>is usually needed to help a decomposition reaction occur</span>
