21. . . . . . . . . is not a periodic feature related to the characteristics of elements.
22. Choose the correct sequence of electrical resistivity of metals.
23. In the Mendeleev periodic table, gaps were left for undiscovered elements. Which of the following elements later found a place in the periodic table?
24. The electronic configuration of an element is 2, 8, 6. It is related to . . . . . . . . .
25. The number of shells in the elements of the third period is . . . . . . . .
26. In Mendeleev's periodic table, which of the following group of elements later found a place in the table?
27. How many metalloids are there in the fourth period of the modern periodic table?
28. In both elements of the 1st period, in . . . . . . . . . the valence electrons are present.
29. The ability of an atom in a chemical compound to attract shared electron is termed as
30. The atomic number of an element is 17, what is it?
Read More Section(Periodic Classification of elements)
Each Section contains maximum 100 MCQs question on Periodic Classification of elements. To get more questions visit other sections.