Question

Indicate which of the given electronic configurations are true ground state configurations for the respective atoms and which are false. (Take care! There are some exceptions to the simple rules.)

Ra --> [Xe]4f145d106s26p67s2

Sc --> [Ar]3d14s2

Si --> 1s22s22p63s23p2

Cr --> [Ar]3d44s2

K --> 1s22s22p63s23p64s1

Answer 1

The electronic configuration of Ra is correct.

Ra --> [Xe]4f145d106s26p67s2

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶ 4f¹⁴5d¹⁰6s²6p⁶7s²

The electronic configuration of Sc is correct

Sc --> [Ar]3d14s2

1s²2s²2p⁶3s²3p⁶3d¹4s²

The electronic configuration of Si is correct

Si --> [Ne] 3s2 3p2

Si --> 1s22s22p63s23p2

Cr --> [Ar]3d44s2;

The correct electronic configuration of Cr is as follows because half filled orbital is more sable.

[Ar] 3d5 4s1

1s22s22p63s23p64s13d5

The electronic configuration of K is correct

K --> 1s22s22p63s23p64s1

[Ar] 4s1