The electronic configuration of Gadolinium (At. No. 64) is
The filling of 4 f-shell begins only when one electron has already been added to 5 d-orbital.
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?
Which of the following processes involves absorption of energy?
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
Which among the following species has the same number of electrons in its outermost as well as penultimate shell?
The statement that is not correct for periodic classification of elements is
The first ionization potential (eV) of Be and B respectively are