Question

what are the main features of the peridic classification of the elements in chemistry
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Answer 1

Answer:

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The periodic table is composed of seven horizontal rows or periods and is numbered between 1 and 7. There is a regular gradation in the properties of elements in the horizontal rows(periods) from left to right. The periodic table is composed of eight vertical columns or groups. They 're numbered between 1 to 8.

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