regularities in the periodic system

7. grade

    начало     1      2     3     4     5     6     7     8      9     10     самопроверка

 

                                    

Problem 1.1 What is the number of the period and what is the number of the group in which the selected element is situated?

 

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Problem 1.2 Which element is situated in:

а) period 3., group ІА      b) period 3., group VІІА   c) period 2., group VІА d) period 5., group ІІА

 

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