| 51. | Who first proposed the atomic theory of matter? |
A. rutherford | |
B. John Dalton | |
C. J. J. Thomson | |
D. Niels Bohr |
| 52. | The shape of the nucleus of an atom is |
A. 10¯⁵ m | |
B. 10¯⁹ m | |
C. 10¯¹º m | |
D. 10¯¹⁵ m |
| 53. | Which of the following is a temporary particle? |
A. electron | |
B. proton | |
C. neutrons | |
D. all of these |
| 54. | Which one of the following best determines the atomic number of an element? |
A. number of protons | |
B. number of protons and electrons | |
C. number of ions | |
D. The number of nucleons |
| 55. | what particles are in the nucleus of an atom |
A. protons and neutrons | |
B. electrons and α particles | |
C. protons and electrons | |
D. electrons and neutrons |
| 56. | Which of the following is a particle with no charge |
A. electron | |
B. Proton | |
C. neutrons | |
D. none |
| 57. | Which fundamental particles are in equal numbers in an atom? |
A. protons and neutrons | |
B. electron and proton | |
C. neutrons and electrons | |
D. electrons, protons and neutrons |
| 58. | Who was the first to determine the charge of the electron? |
A. Thomson | |
B. millican | |
C. rutherford | |
D. coulomb |
| 59. | What is the charge on an electron? |
A. -1.6 x 10¯¹⁹ C | |
B. +1.6 x 10¯¹⁹ C | |
C. -1.6 x 10¹⁹ C | |
D. + 1.6 x 10¹⁹ C |
| 60. | Rutherford’s scattering proved the existence of |
A. atoms of all matter | |
B. atom’s electron | |
C. neutrons of an atom | |
D. nucleus of an atom |