An atom is the smallest unit of matter that has the properties of distinctive a chemical element. It is also called the basic building block of chemistry. Every solid, liquid, gas, and plasma is made of neutral or ionized atoms. Most of the atoms are empty space. The rest are made of a nucleus and one or more electrons around the nucleus. The nucleus is made of one or many protons and some neutrons. The electrons are the lightest and negatively charged particles. The nucleus is small and dense compared to the electrons.
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