Demerits of Mendeleev's Periodic Table

Q.

Compare the properties of germanium with the properties of eka-silicon predicted by Mendeleev

Q. How could the modern periodic table remove various anomalies of Mendeleev‘s periodic table?

Q. a) Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why ? [2 Marks]

b) Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table. [4 Marks]

c) Write a short note on ionisation energy. [1 Mark]