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 of electrons present in one mole of methane is:
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 x 1027
3. 5.48 × kg, 9.65 × C
4. 9.65 × C, 1.098 x 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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