Dot-and-cross diagram of a calcium atom (2, 8, 8, 2)

An example figure from the Dot-and-Cross Diagram generator.

A calcium atom drawn as four shells around the symbol Ca, with 2, 8, 8 and 2 electrons as dots
A calcium atom, Ca, with every shell drawn as a circle around its symbol and its 20 electrons as dots: 2, 8, 8 and 2 from the inside out. The electrons are paired at the top, right, bottom and left of each ring, as students are taught to draw an electron arrangement.

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Answer key

  • Ca: 2,8,8,2

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