What is the value of the standard enthalpy of formation of an element in its most stable form?

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Which subshell is represented by the actinides family?