When can a hypothesis be elevated to the status of a theory? a) when it is validated by an experiment b) when data gathered from an experiment precisely fits predictions c) when it can be proved to be true d) when it meets the test of repeated experimentation

d) when it meets the test of repeated expected experimentation.  

Explanation:

A hypothesis is a guess based on observation in the the behavior of nature. This guess is used to formulate the relevant experiments and when the experimental results consistently meet the expected outcomes then the hypothesis graduates into a theory. Theories form the basis of many fields in science as they try to explain the behavior of nature.  

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.