12. What is the lowest energy electron configuration of tantalum (Ta)? A) 1s22s2

Question

12. What is the lowest energy electron configuration of tantalum (Ta)?

A) 1s22s22p63s23p63d104s24p64d105s25p3

B) 1s22s22p63s23p63d104s24p64d105s25p66s25d3

C) 1s22s22p63s23p63d104s24p64d105s25p65d3

D) 1s22s22p63s23p63d104s24p64d104f3

E) 1s22s22p63s23p63d104s24p64d105s25p66s24f145d3

13. Which are the correct lowest energy electron configurations for Fe and Ti3+?

A) [Ar]4s24p6 and [Ar]4s24p3

B) [Ar]4s24d6 and [Ar]4s24d1

C) [Ar]4s13d7 and [Ar]4s23d1

D) [Ar]4s23d6 and [Ar]3d1

E) [Ar]4s23d6 and [Ar]4s1

Explanation / Answer

12) option E is correct.

The atomic number of ta is 73 and fill out 73 electrons in orbitals.

13) option D is correct

Atomic number of Fe is 26 and fill out all the electorns in orbitals.

Atomic number of Ti is 22 and the charge is +3 so the total number of electrons = 22 - 3 = 19.

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