Question

Three elements X, Y, and Z have the electronic configurations: 1s2 2s2 2p6 3s2 3p6 ; 1s2 2s2 2p6 3s2 and 1s2 2s2 2p6 3s2 3p6 4s1 respectively. The first ionization energies of these elements (not in the same order) are 418.9, 737.7 and 1520.7 (in kJ/mol) and their atomic radii are 1.91, 1.36 and 2.03 (in Å). Match the appropriate values of ionization energy and atomic radius to each configuration. Justify your matching.​

Answer 1

Answer:

The electron configuration of an atom shows the number of electrons in each sublevel in each energy level of the ground state atom.

Here, 1s

2

2s

2

2p

6

3s

2

3p

2

3d

5

4s

1

is ground state electronic configuration of Cr.

Note: To write the electronic configuration a more convenient way is shown in figure below.

Answer 2

Explanation:

The electron configuration of an atom shows the number of electrons in each sublevel in each energy level of the ground state atom.

Here, 1s²2s²2p63s²3p²3d54s¹ is ground state electronic configuration of Cr.