In the following questions two Statement - 1 (Assertion) and Statement - 2 (Reason) are provided. Each question has 4 choices (a), (b), (c) and (d) for its answer, out of which ONLY ONE is correct. Mark your responses from the following options:

Statement - 1 : Electromagnetic radiation will be emitted for the transition $2 P_{z} \to 2 p_{x}$ .

Statement - 2 : No transition of electron takes place between $2 P_{z}$ and $2 P_{x}$ orbitals.

Statement - 1 : The transition of electrons $n_{3} \to n_{2}$ in H - atom will emit radiation of higher frequency than $n_{4} \to n_{3}$ .

Statement - 2 : Principal shells $n_{2}$ $n_{3}$ have lower energy than $n_{4}$ .

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Statement 1: An element that has the electron configuration 1s22s22p63s23p63d34s2 is a transition element. Statement 2: In the periodic table atoms of transition elements 1s, 2s, 2p, 3s,and 3p orbitals are completely filled in the ground state.

The correct option is B Both Statement 1 and Statement 2 are correct but Statement 2 is the correct explanation of Statement 1 As the valence electron in the given element lends in d orbital, it is a transition metal and in transition elements 1s,2s,2p,3s,3p orbitals are fully filled.

Statement 1: An element that has the electron configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}$ is a transition element.

Statement 2: In the periodic table atoms of transition elements 1s, 2s, 2p, 3s,and 3p orbitals are completely filled in the ground state.

The correct option is B
Both Statement 1 and Statement 2 are correct but Statement 2 is the correct explanation of Statement 1

As the valence electron in the given element lends in $d$ orbital, it is a transition metal and in transition elements $1 s, 2 s, 2 p, 3 s, 3 p$ orbitals are fully filled.