Chapter 5 Atomic Models Different metal containing compounds emit colored light when fireworks burn. This colored light is a combination of a series of colors called a spectral pattern(谱带) Each element emits its own characteristic spectral pattern, which can be used to identify the element. This allowed the scientists in 1900s to develop models of the atoms internal structure
Chapter 5 Atomic Models Different metal containing compounds emit colored light when fireworks burn. This colored light is a combination of a series of colors called a spectral pattern. (谱带) Each element emits its own characteristic spectral pattern, which can be used to identify the element. This allowed the scientists in 1900s to develop models of the atom’s internal structure
5. 1 Models help us visualize the invisible world ofatoms Atom is very small in Ping-Pong ba in the Earth
5.1 Models help us visualize the invisible world of atoms Atom is very small
We can not see them in the usual sense This is because light travels in waves and atoms are smaller than the wavelengths of visible light, which is the light that allows the human eye to see things So we can not see atoms through the media of light, even with a microscope light An atom A bacterum 10m m
We can not see them in the usual sense. This is because light travels in waves and atoms are smaller than the wavelengths of visible light, which is the light that allows the human eye to see things. So we can not see atoms through the media of light, even with a microscope
We can see atoms indirectly through scanning tunneling microscope(STM), which was invented in 1980s figl: Scanning tunne ling microscope ig3: an STM image of mono Fig2: an image of gallium layer of perylene derivativ and arsenic atoms graphite substrate, where the obtained with an STm epitaxial relationship is observed between the organic molecule and the substrate graphite
We can see atoms indirectly through scanning tunneling microscope (STM), which was invented in 1980s. fig3 : an STM image of monolayer of perylene derivative on graphite substrate, where the epitaxial relationship is observed between the organic molecule and the substrate graphite Fig1:Scanning tunneling microscope Fig2:an image of gallium and arsenic atoms obtained with an STM
5.2 Light is a form ofenergy Wavelength(nm 10 1016 requency(Hz) Gamma X rays Ultra Infrared Microwave Radio waves violet Type of radiation X ray Sun lam Heat Microwave ovens, UHF TV FM radio lamps police rad satellite stations 400nm
5.2 Light is a form of energy