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Through the development of physics, atomic models have incorporated quantum principles to better explain and predict the behavior.Every atom is composed of a nucleus and one or more electrons bound to the nucleus.
This online resource provides a clear and concise summary of measurement and uncertainty.
This is like putting a North-South magnet next to a South-North magnet. However, sometimes (in iron, nickel, and cobalt for example) you’ll have one or more electrons.
The magnetic fields of these electrons aren’t canceled out by another, oppositely-oriented, electron.
Atoms are very small; typical sizes are around 100 picometers (a ten-billionth of a meter, in the short scale).
Atoms are small enough that attempting to predict their behavior using classical physics – as if they were billiard balls, for example – gives noticeably incorrect predictions due to quantum effects.