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

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 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...

3. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

   A. 159 B. 1837 C. 2537 D. 10000...

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

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

5. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second?

   A. 1100 B. 2200 C. 3300 D. 4400...

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

   A. α B. β C. γ D. α & β...

7. 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....

8. 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...

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

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

10. Nuclides having the same atomic numbers are termed as___________________?

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