regularities in the periodic system 

7. grade

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Problem 8. Connect the chemical symbols of two elements from group one with a red intercept. Connect the chemical symbols of another two elements from group one with a red intercept. How are the chemical symbols of the elements from group IA located on the spiral? 

Connect the chemical symbols of two elements from group three with a green intercept.

Connect the chemical symbols of other two elements from group three with a green intercept. How are the chemical symbols of the elements of group IIIA located on the spiral?

 

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Here is another way of looking at the periodic system of chemical elements.

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