How would you justify the presence of 18 elements in the 5th period of the Periodic Table?

Question

TextModern Periodic Law and Long Form of Periodic Table

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What is the basic difference in approach between the Mendeleev's Periodic Law and the Modern Periodic Law?

In terms of period and group where would you locate the element with Z =114?

In the modern periodic table, the period indicates the value of :

Which of the following statements related to the modern periodic table is incorrect?