A. Electrons
B. Neutrons
C. Protons
D. Neutrons plus protons (i.e., nucleons)
Related Mcqs:
- The new nucleus formed after β-decay of a radioactive element has___________________?
A. Less atomic number
B. Less atomic weight
C. More atomic number
D. More atomic weight - The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is_____________________?
A. Less
B. More
C. Same
D. Much more - Out of the following, nucleus of _____________ atom contains the largest number of neutrons?
A. U-235
B. U-238
C. U-239
D. Pu-239 - Neutrons have mass approximately equal to that of _____________ atoms?
A. Hydrogen
B. Helium
C. Deuterium
D. None of these - 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 - 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 - 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 - 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 - The mass number of an element is not changed, when it emits _______________ radiations?
A. α & β
B. β & γ
C. γ & α
D. α, β, & γ - 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
