Which of the following processes involves absorption of energy?
O– + e– → O2–
The second electron gain enthalpy of an element is positive, i.e., energy is absorbed.
The correct order according to size is
The successive ionisation energy values for an element ‘X’ are given below:
1st ionisation energy = 410 kJ mol–1
2nd ionisation energy = 820 kJ mol–1
3rd ionisation energy = 1100 kJ mol–1
4th ionisation energy = 1500 kJ mol–1
5th ionisation energy = 3200 kJ mol–1
Find out the number of valence electrons for the atom ‘X’.
In which of the following arrangement the order is not according to the property indicated against it?
Which is the correct order of electronegativity?
The set representing the correct order of first ionisation energy is
The order of first ionisation energies of the elements Li, Be, B, Na is
An element with atomic number 106 has been discovered recently. Which of the following electronic configurations will it possess?
The ionic radius of ‘Cr’ is minimum in which of the following compounds?
In which of the following compounds does the ratio of anion size to cation size has the lowest value?
The five successive ionization energies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol–1 respectivley. The number of valence electrons is