regularities in the periodic system
7. grade
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regularities in the periodic system 7. grade |
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1. Number the periods and groups in the table.
2. Fill in the missing data for the chemical element with serial number 1 – chemical symbol and name.
3. Write down the serial numbers of the first four elements from the group of inert and noble elements.
4. Write down the missing serial numbers of elements from period 4.
5. Write down the missing serial numbers and the chemical symbols of the elements from group ІІА.
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