Q: How is energy expressed when it is released in a chemical reaction?


Read this paragraph and choose the correct option from the provided answers:

When energy is released in a chemical reaction or process, that energy is expressed as a negative number. Figure below shows electron affinities in kJ/mol for the main group elements.

 Choices:

- as an equation

- as a percentage

- as a positive number

- as negative number


A:
as negative number