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

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Solution

General configuration of transition element is $(n - 1) d^{1 - 10} {n s}^{0, 1, 2}$
Therefore the given element is transition element. Also, $1 s, 2 s, 2 p, 3 s$ and $3 p$ orbitals are fully filled in the ground state, but second statement is not the correct explanation of first statement.

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

General configuration of transition element is (n−1)d1−10ns0,1,2Therefore the given element is transition element. Also, 1s,2s,2p,3s and 3p orbitals are fully filled in the ground state, but second statement is not the correct explanation of first statement.

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

General configuration of transition element is $(n - 1) d^{1 - 10} {n s}^{0, 1, 2}$
Therefore the given element is transition element. Also, $1 s, 2 s, 2 p, 3 s$ and $3 p$ orbitals are fully filled in the ground state, but second statement is not the correct explanation of first statement.