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According to atomic theory, what is the primary building block of matter?
Electron
Proton
Molecule
Atom
Answer
An atom, the basic unit of matter, comprises a dense nucleus containing positively charged protons and uncharged neutrons surrounded by a cloud of rapidly moving, negatively charged electrons. The number of protons determines an element's identity and its chemical properties. Atoms can combine to form molecules, the fundamental units of compounds, through chemical bonds between their outermost electrons.
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