In Mendelev's modified periodic table, t...

In Mendelev's modified periodic table, there are_________vertical column called groups.

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In Mendeleev's original periodic table, there were six horixontal rows (called seried) further subdivided to give a total of 12 . In Mendeleev's modified periodic table, there are ________horizontal rows (called periods).

In the modified Mendeleev's periodic table, the 18 vertical columns were divided into______groups.

In Mendeleev's periodic table group VIII contains________elements.

The short form of the modern periodic table of the elements (also called Bohr's table) is the most convenient and widely used version of the periodic table. It consists of_______horizontal rows called periods and________vertical columbs called groups.

Write the number of vertical columns in the modern periodic table. What are these columns called ?

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?

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