The most chemically reactive metals are in group 1 of the periodic table. true or false

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

What are two different ways you could find the value of a? explain these methods.