OPTIONS:
--solution.
--transformation.
--variating.
--transition.
Given those answer options, answer the question: Answer the following question given this paragraph: The transition metals are an interesting and challenging group of elements. They have perplexing patterns of electron distribution that don't always follow the electron filling rules. Predicting how they will form ions is also not always obvious. Q: What kind of metals have perplexing patterns of electron distribution that don't always follow the electron filling rules? A:
A:
transition