Q1 of 49 Page 124

How many groups and periods are present in the modem periodic table?

Vertical columns in the periodic table are called “groups”. There are 18 such groups in modern periodic table. Horizontal rows are called “periods”. There are 7 such periods in modern periodic table.


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Why did Mendeleev left some gaps in his periodic table?

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Why was the position of hydrogen not fixed in Mendeleev's periodic table?

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What is the main difference between Mendeleev's and modern periodic law?

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Elements of the same group have similar properties. Why?