Property which is same for the following species is:
N3–, O2–, F–, Na+, Mg2+ and Al3+
1. Ionic radii
2. Number of electrons
3. Nuclear charge
4. None of the above
The total number and mass of neutrons in 7 mg of 14C would be :
(Assume that mass of a neutron = 1.675 × 10–27 kg)
\(1 .\) \(2 . 41\) \(\times\) \(\left(10\right)^{21}\) \(,\) \(4 . 03\) \(\times\) \(\left(10\right)^{– 6}\) \(kg\)
\(2 .\) \(6 . 23\) \(\times\) \(\left(10\right)^{23}\) \(,\) \(1 . 67\) \(\times\) \(\left(10\right)^{- 21} kg\)
\(3 .\) \(1 . 22\) \(\times\) \(\left(10\right)^{22}\) \(,\) \(4 . 03\) \(\times\) \(\left(10\right)^{6}\) \(kg\)
\(4 . 2 . 41\) \(\times\) \(\left(10\right)^{21}\) \(,\) \(4 . 03\) \(\times\) \(\left(10\right)^{- 6}\) \(g\)
An atom of an element contains 29 electrons and 35 neutrons. The number of protons in the element would be:
1. | 29 | 2. | 35 |
3. | 6 | 4. | 64 |
The charge on the oil drop is –1.282 × 10–18C. The number of electrons present in it would be :
1. 15
2. 8
3. 2
4. 6
An element with a mass number of 81 contains 31.7% more neutrons as compared to protons. The atomic symbol of the element would be :
An ion with a mass number of 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. The symbol of the ion is :
The mass and charge of one mole of electrons are, respectively:
1. 5.48 × kg, 9.65 C,
2. 5.48 × C, 1.098 × 1027
3. 5.48 × kg, 9.65 × C
4. 9.65 × C, 1.098 × 1027
The maximum number of neutrons are present in the nuclei of:
The complete symbol for the atom with the given atomic number (Z) and atomic mass (A) would be, respectively :
i. | Z = 17 , A = 35. |
ii. | Z = 92 , A = 233. |
iii. | Z = 4 , A = 9. |
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