Explain what accounts for the variable oxidation states, complete ions and colours of transition elements.

Which is a character of nuclear fusion but not nuclear fission

Two things that biomedical has invented or innovated

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)? a. 5.0 × 103 b. 5.0 × 10-3 c. 5.0 × 1017 d. 5.0 × 10-17