Most of the inner transition elements exist as stable tripositive ions due to the loss of electrons present:

Q. The valence electronic configuration of an atom is $6s^2$. If d orbital of the penultimate shell contains two unpaired electrons, calculate the atomic number

Q. An element of p-block in which last electron enters into s-orbital of valence shell instead of p-orbital is:

Q. The nuclear charge actually experienced by an electron is termed as the effective nuclear charge. The effective nuclear charge Z* actually depends on the type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is $s>p>d>f$ (for the same value of $n$)
The phenomenon in which penultimate shell electrons act as screen or shield in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. The penultimate shell electrons repel the valence shell electron to keep them loosely held with the nucleus. It is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy.
Which of the following valence electron experience maximum effective nuclear charge?

Q. Draw the valence shell molecular orbital diagram of oxygen molecule and predict its magnetic nature.

Q. Assertion :$BC{l}_3$ is a Lewis acid. Reason: $BC{l}_3$ can accept a pair of electrons due to the presence of vacant orbital in the valence shell of boron