What is an Atom? defination
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the smallest part into which an element can be divided
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An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
- Components: Electrons and a compact nucleus of protons and neutrons
- Electric charge: zero (neutral), or ion charge
- Mass range: 1.67×10−27 to 4.52×10−25 kg
- Diameter range: 62 pm (He) to 520 pm (Cs
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