Which type of radioactive particle(s) has/have been emitted in the following equation?

Which element is the least metallic between cadmium, silver, zinc, or iron?

Classify this reaction: 2al+n2-> aln.

Generally, observed behavior that can be formulated into a statement, sometimes mathematical in nature, is called a(n): a. observation. b. measurement. c. theory. d. natural law. e. experiment.