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Describe the structure of an atom? 

Difficulty: Easy

Structure of an atom:

Protons and neutrons are located inside nucleus of atom while electrons orbit in energy levels (electron shells) around the nucleus. The number of electrons in the outermost shell determines the manner in which atoms react with each other.

Molecule:

A molecule is the smallest part of a compound that retains the properties of that retains the properties of the compounds.

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