Atoms

Impact on the world

How do you know atoms exist?

• Resolution: 0.1 nm lateral, 0.01 nm depth• Scanning Tunnelling microscope• Iron atoms on copper surface

How do you know atoms exist?

Famous examples of reactions at atomic level

• Atomic bomb• North Korea tested a bomb on 12 Feb 2013;

devastation similar to nuclear bomb in Hiroshima in WWII

Famous examples of reactions at atomic level

• Fukushima Daiichi nuclear disaster 11 Mar 2011• Nuclear meltdown at power plant due to

earthquake and tsunami

• http://www.youtube.com/watch?v=D91T-B-PVE0

Famous examples of reactions at atomic level

• Nuclear fission

Famous examples of reactions at atomic level

• Nuclear fusion