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How many vertical columns are there in t...

How many vertical columns are there in the Modern Periodic Table?

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In the Modern Periodic Table, there are 18 vertical columns of elements called groups.
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How many vertical columns are there in the periodic table ?

Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic charcter of elements very on moving down a vertical column ? How does the size of atomic radius vary on moving left to right in a horizontal row ? Give reason in pupport of your answer in the above two cases.

How many groups are there in the modern periodic table as per the latest IUPAC convention ?

In the modern periodic table, the elements are arranged in the increasing order of their atomic number. This arrangement is based on the modern periodic law, which states that the properties of elements are a periodic function of their atomic numbers. In the modern periodic table, each column is called a group and each row is called a period. Elements within the same group show similarity and gradation in properties. This is due to the same number of electroms in the outermost shell . Based on the above paragraph, answer the following question: How many groups are there in the modern periodic table?