Which of the following is true about elements?
elements can combine into compounds with new properties
elements only combine with other elements of the same type to form compounds.
elements can be broken down into different types of atoms.
elements are made of compounds with different properties.

The first one

Explanation:

Elements are as simple as it gets

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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