| 91. | The maximum number of atoms that an element can have in its second orbit is |
A. 8 | |
B. 32 | |
C. 18 | |
D. 2 |
| 92. | If the atomic number of carbon is 6 and the atomic weight is 12, then how many electrons are there in its nucleus? |
A. 6 | |
B. 12 | |
C. 18 | |
D. 0 |
| 93. | The number of electrons in an atom of atomic number Z and mass number A is |
A. Z | |
B. A -Z | |
C. A | |
D. Z-A |
| 94. | The number of protons in the element ₉₂U²³⁵ is – |
A. 92 | |
B. 146 | |
C. 235 | |
D. 135 |
| 95. | The atomic number of sodium is 11 and the atomic mass is 23, then the number of electrons, neutrons and protons in it are respectively |
A. 11,11,12 | |
B. 12,11,12 | |
C. 12,12,11 | |
D. 11,12,11, |
| 96. | The number of neutrons in ₉₂U²³⁸ is – |
A. 146 | |
B. 234 | |
C. 90 | |
D. 148 |
| 97. | Which one of the following statements is most appropriate regarding the atomic mass of an element? |
A. The atomic mass of an element is the sum of the protons and neutrons present in an atom of that element. | |
B. Unlike the mass number, the atomic weight of an element can vary | |
C. The atomic mass of an element is an integer | |
D. All atoms of an element have the same atomic mass |
| 98. | The effective radius of an atom is – |
A. 10¯⁶ m | |
B. 10¯¹º m | |
C. 10¯¹⁴ m | |
D. 10¯¹⁵ m |
| 99. | Which of the following is a particle with 20 neutrons and 18 electrons? |
A. ₁₇CI³⁷ | |
B. ₁₈Ar³⁸ | |
C. ₁₉K³⁹ | |
D. ₁₆S³⁶ |
| 100. | The atomic number of an element is 35 and it has 18 electrons, then the number of protons in it will be – |
A. 17 | |
B. 18 | |
C. 20 | |
D. 15 |