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Question

The smallest building block of any substance is  ______


  1. Compound

  2. Atom

  3. Element

  4. Molecule


Solution

The correct option is B

Atom


The smallest building part of any substance is an atom.

The radius of a typical atom is one tenth of a billionth of a meter. A string of atoms one meter (about 3 ft) long contains an atom for every person in the world. 

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