Which discovery caused a revision in the periodic law as stated by Mendeleev ?

Related Mcqs:

1. Which element was not known when Mendeleev proposed his classification ?

   A. Hydrogen
   B. Sodium
   C. Copper
   D. Germanium

2. Rutherford bombarded _________________ particles in discovery of nucleus?

   A. Gamma-rays
   B. Alpha-rays
   C. Beta-rays
   D. X-rays

3. The discovery of neutron became very late because _______ ?

   A. It does not carry any charge
   B. It does not move
   C. It is a fundamental particle
   D. It is present in nucleus

   Submitted by: Rashid Mehmood

4. Which one of the following results in the discovery of proton.

   A. Cathode rays
   B. Canal rays
   C. X-rays
   D. Alpha rays

   Submitted by: Babar Ali Kunbhar

5. Elements in the same vertical group of the periodic table have same_______________?

   A. Number of valence electrons
   B. Atomic number
   C. Atomic mass
   D. Atomic volume

6. Periodic table provides a basic framework to study elements with respect to their__________________?

   A. Physical properties
   B. Chemical properties
   C. Properties of their compounds
   D. All

7. Best position of hydrogen in the periodic table is above I.A Group which is mainly due to_______________?

   A. Both are electropositive
   B. Similar outer most shell electronic configuration
   C. Both form ionic compounds
   D. All

8. Many properties of an element and its compounds can be predicted from the position of the element in the periodic table. What property could not be predicted in this way ?

   A. The nature of its oxides
   B. The charge on its ions
   C. The formula of its oxide
   D. Its number of isotopes

9. The longest period in the modern periodic table is___________________?

   A. 6th
   B. 7th
   C. 2nd and 3rd both
   D. 5th

10. Which one of the following is not a periodic property ?

    A. Melting point of elements
    B. Boiling point of elements
    C. Ionization energy of elements
    D. Coordination number of ions