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

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

   A. Neutrons
   B. Electrons
   C. Protons
   D. Either B. or C.

3. When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as____________________?

   A. Isomers
   B. Isotopes
   C. Isobars
   D. Isotones

4. Which one is different for the neutral atoms of the isotopes of an element ?

   A. Atomic weights
   B. Atomic numbers
   C. Number of protons
   D. Number of electrons

5. 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

6. Atoms with same number of neutrons, but different number of nucleons are called___________________?

   A. Isotones
   B. Isobars
   C. Isotopes
   D. Isostere

7. Neutrons have mass approximately equal to that of _____________ atoms?

   A. Hydrogen
   B. Helium
   C. Deuterium
   D. None of these

8. Atoms of U-238 and U-235 differ in structure by three_____________________?

   A. Electrons and three protons
   B. Protons
   C. Neutrons
   D. Electrons

9. What is the average life of a radioactive atom having a ‘half life period’ of T ?

   A. 1.44 T
   B. 0.144 T
   C. 14.4 T
   D. 2T

10. The size of an atom is of the order of one __________________?

    A. °Angstrom
    B. Fermi
    C. Micron
    D. mm