Elements which emit natural radioactivity are known as __________ ?

Related Mcqs:

1. The earth absorb radiation in Visible range but emit radiation at the same rate in the:

   A. Ultra voilet
   B. Gamma rays
   C. Infrared
   D. All of these

   Submitted by: Said wali shah

2. What is the name of that system, which uses radioactivity to decide the period of materials of-pre-historic period ?

   A. Radium dating
   B. Uranium dating
   C. Carbon dating
   D. Deuterium dating

   Submitted by: Abid Hussain

3. Which of the p-block elements are not representative elements ?

   A. Alkali metals (I-A)
   B. Group-14 elements (IV-A)
   C. Group-18 elements (VIII-A)
   D. Halogens (VII-A)

4. d-block elements are also called as __________?

   A. Inner Transition
   B. Outer Transition
   C. Alkali Metals
   D. Both B & C

   Submitted by: Aamir khan Hullio

5. Actinides are the elements with atomic numbers from __________?

   A. 97 to 104
   B. 101 to 115
   C. 89 to 103
   D. 36 to 43

   Submitted by: Fahad Mehsud

6. All the transition elements show_________________?

   A. Similar physical properties
   B. Similar chemical properties
   C. Both A and b
   D. None

7. Inner transition elements are called _________________?

   A. Lanthanides
   B. Actinides
   C. Rare earth metals
   D. All

8. In which of the following pairs are elements belonging to the same group ?

   A. Boron & Beryllium
   B. Nitrogen & Phosphorous
   C. Magnesium & Aluminium
   D. Gallium & Helium

9. Boron is non metal while other elements of IIIA group are metals. This is because______________?

   A. it has small size
   B. it has high nuclear charge
   C. it forms molecular addition compounds
   D. all of the above

10. Atoms of all the elements always contain in nucleus:

    A. Proton and neutron
    B. Neutron and electron
    C. Proton
    D. Neutron

    Submitted by: Shumail Bashir