What are the smallest units an element can be broken down into and still retain its defining properties?

molecules
protons, neutrons, and electrons
nanograms
atoms

Option (a) is the correct answer.

Explanation:

A molecule is defined as the substance in which same or different atoms chemically combine together.

For example, , , are all molecules.

When we break down a molecule into its constituent atoms then properties of its atoms remain the same.

Hence, we can conclude that molecules are the smallest units an element can be broken down into and still retain its defining properties.

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.