11. | Who discovered the wave nature of electron? |
A. Thomson | |
B. Louis de Broglie | |
C. Rutherford | |
D. Heisenberg |
12. | What is the smallest particle of an element called? |
A. atom | |
B. electron | |
C. neutron | |
D. Proton |
13. | According to Dalton’s atomic theory, the smallest particle in which matter can exist is called: |
A. molecule | |
B. neutron | |
C. proton | |
D. ion |
14. | Chemical behavior of an atom is determined by__ |
A. Atomic number | |
B. Mass number | |
C. Binding energy | |
D. Number of isotopes |
15. | The mass number of an atom is the sum of number of: |
A. protons and electrons | |
B. protons and nucleons | |
C. protons and neutrons | |
D. electrons and nucleons |
16. | The number of ______ is equal to the difference between the mass number of the atom and the atomic number. |
A. Both protons and electrons | |
B. Neutrons | |
C. Electrons | |
D. Protons |
17. | The nuclear particle having no mass and no charge, but only spin is |
A. Electron | |
B. Proton | |
C. Neutrino | |
D. Meson |
18. | The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic energy and potential energies are respectively: |
A. -3.4 eV, -3.4 eV | |
B. -3.4 eV, -6.8 eV | |
C. 3.4 eV, -6.8 eV | |
D. 3.4 eV, 3.4 eV |
19. | Rutherford’s scattering experiment is related to the size of the: |
A. nucleus | |
B. atom | |
C. electron | |
D. neutron |
20. | ______ discovered that the nucleus is positively charged |
A. Thomson | |
B. Rutherford | |
C. Bohr | |
D. James Chadwick |