Which of the following remains unchanged on descending a group in the periodic table
Each group has a fixed number of valence electrons.
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 electronic configuration of Gadolinium (At. No. 64) is
The first ionization potential (eV) of Be and B respectively are
The radii of F, F–, O and O2– are in the order of