The Structure Of an Atom

Página 1

1. Atoms are very small

2. Atoms have a radius of about 1x10^-10m

3. An atom consists of a positively charged nucleus surrounded by negatively charged electrons

4. The nucleus of an atom contains protons and neutrons

5. The nucleus is very small in comparison to the size of the whole atom

6. The radius of a nucleus is less than 1/10,000 of the radius of an atom

7. Most of the mass of an tom is concentrated in the nucleus

8. The electrons are arranged at different distances from the nucleus

9. The electrons are arranged at different energy levels

10. The electron arrangement of sodium is 2,8,1 = 11

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Página 2

1. The electron arrangement of sulfur is 2,8,6 = 16

2. The electron arrangement may change with the absorption of electromagnetic radiation or by the emission of electromagnetic radiation

3. Electromagnetic radiation includes radiowaves, microwaves, infrared radiation, visible light, ultraviolet, x-rays and gamma rays

4. Absorption - Taken in

5. When electromagnetic radiation is absorbed an electron moves to a higher energy level.

6. When electromagnetic radiation is absorbed an electron moves further from the nucleus

7. Emission - Release

8. An electron moving to a lower energy level will cause an emission of electromagnetic radiation

9. An electron moving closer to the nucleus will cause an emission of electromagnetic radiation.

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