Electron arrangement
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What are energy levels (shells) ?
In atoms electrons are arranged in energy levels (often called shells). These are the areas of space around the nucleus where electrons with a certain energy will be found. Electrons with the lowest energy are found nearest the nucleus and those with higher energy are found in energy levels further from the nucleus.
What are the three rules for writing the electron arrangement for the first 20 elements?
• Start with the lowest (first) energy level outwards. • The lowest energy level holds a maximum of two electrons. • The energy levels two and three holds a maximum of eight electrons.
What page on data booklet are the electron arrangements listed?
The electron arrangement are listed in the data booklet on page six.