What is the number of electrons present in the $3d$ orbital of $Ti$ in the $+2$ oxidation state?

The number of atomic orbitals from the following having $5$ radial nodes is $.......$. $7s, 7p, 6s, 8p, 8d$

The five valence electrons of $_{15}P$ are represented as shown in the figure. If the spin quantum number of $B$ and $Z$ is $+1/2$,which of the following groups has three identical quantum numbers?

The electrons,identified by quantum numbers $n$ and $l$ as $(i) n = 4, l = 1$,$(ii) n = 4, l = 0$,$(iii) n = 3, l = 2$,$(iv) n = 3, l = 1$,can be placed in order of increasing energy,from the lowest to highest,as:

"Pairing of electrons in the orbitals belonging to the same subshell does not occur unless each orbital belonging to that subshell has got one electron each." This statement is known as

An element has $13$ electrons in the $M$ shell in its ground state. Which element could it be?