Question

The statement that is not correct for periodic classification of elements is

Solution

Correct option is

For transition elements, the d-subshells are filled with electrons monotonically with increase in atomic number.

In principle, electrons are added one at a time to the penultimate d-orbitals but due to extra stability of d5 and d10 configurations, two electrons appear to have entered the d-shell due to shifting of one electron from nsto (n – 1) d orbital.  

SIMILAR QUESTIONS

Q1

Which is the correct order of electronegativity?

Q2

The set representing the correct order of first ionisation energy is

Q3

The order of first ionisation energies of the elements Li, Be, B, Na is

Q4

An element with atomic number 106 has been discovered recently. Which of the following electronic configurations will it possess?

Q5

The ionic radius of ‘Cr’ is minimum in which of the following compounds?

Q6

Which of the following processes involves absorption of energy?

Q7

In which of the following compounds does the ratio of anion size to cation size has the lowest value?

Q8

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

Q9

Which among the following species has the same number of electrons in its outermost as well as penultimate shell?

Q10

The electronic configuration of Gadolinium (At. No. 64) is