The atomic number of an element is equal to the number of ______________ present in its atom?

Related Mcqs:

1. The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element ?

   A. A + Z
   B. A – Z
   C. A
   D. Z

2. How many atoms are present in one gm-atom of an element ?

   A. 2 × 1023
   B. 6 × 1023
   C. 6 × 1032
   D. 5 × 105

3. The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to ______________ gm?

   A. 1/4
   B. 1/8
   C. 1/2
   D. 1/16

4. The atomic number of a radioactive element is not changed, when it emits _____________ rays?

   A. α
   B. β
   C. γ
   D. α & β

5. The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________?

   A. 1
   B. 0.5
   C. 2
   D. 4

6. The atomic mass of an element is fractional, because ______________________?

   A. Of uncertainty principle
   B. It may have isobars
   C. It contains neutrons
   D. It may have isotopes

7. 75% of a radioactive element decays in 6 hours. Its half life period is ______________ hours?

   A. 3/4
   B. 1/6
   C. 3
   D. 4

8. Energy equivalent to one atomic mass unit (amu) is ______________ MeV?

   A. 9.31
   B. 93.1
   C. 931
   D. 9310

9. The ratio of volume of an atom to that of its nucleus is__________________?

   A. 1012
   B. 10-12
   C. 10-8
   D. 108

10. The ratio of atomic radius to its nuclear radius is about___________________?

    A. 105
    B. 108
    C. 1012
    D. 1015