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प्रश्न
What are isoelectronic ions? Give examples.
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उत्तर
There are some ions of different elements having the same number of electrons are called isoelectronic ions.
Example: Na+, Mg2+, Al3+, F–, O2– and N3–
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संबंधित प्रश्न
Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.
| IE1 | IE2 | IE3 | IE4 | IE5 |
| 577.5 | 1,810 | 2,750 | 11,580 | 14,820 |
The element is
In the third period the first ionization potential is of the order.
The element with positive electron gain enthalpy is
Which of the following orders of ionic radii is correct?
What is the effective nuclear charge?
How would you explain the fact that the second ionisation potential is always higher than the first ionisation potential?
By using Pauling's method calculate the ionic radii of K+ and Cl− ions in the potassium chloride crystal. Given that `"d"_("K"^+) - "Cl"^-` = 3.14 Å
Explain the following, give an appropriate reason.
First ionisation potential of the C-atom is greater than that of the B atom, whereas the reverse is true is for the second ionisation potential.
What is the screening effect?
State the trends in the variation of electronegativity in groups and periods.
