Question

How many half-filled orbitals are there in a manganese (atomic number 25) atom?

A. 4

B. 1

C. 5

D. 3

E. 2

Answer 1

Is B the correct answer?

Answer 2

no. its not,

write the electronic config.

Answer 3

1s2 2s2 2p6 3s2 3p6 3d5 4s2

Answer 4

the complete electronic configuration

Answer 5

is this correct?

Answer 6

absolutely. correct. gd!

Answer 7

now how many unpaired electrons are there

Answer 8

can you explain how to know how many unpaired electrons there are?

Answer 9

except for 3d, each orbital has even number of electrons, which implies paired electrons.

do you know how many orbitals are there in d

Answer 10

5 orbitals?

Answer 11

yes.... right,

now you see that 3d subshell has 5 orbitals and 5 electrons are to be housed in these 5 orbitals.

try to fill 5 electrons in 5 orbitals.
you will have the answer,

Answer 12

u know hund's rule of maximum multiplicity?

the only way to do this is to fill each orbital with 1 electron

and this arrangement will give you 5 alone electrons.....(which are not paired up)

Answer 13

any difficulty.?

Answer 14

I think I understand now. but how do you know which rule to use to find half-filled orbitals?

Answer 15

there are three main rules to write electronic configurations.

1) afbau principle
2) hunds rule of maximum multiplicity
3) pauli's exclusion principle..................... this last one is of minimal importance in writing configurations but you must learn the above two to know how to write electronic configuration

Answer 16

Ok!!! Thanks a lot!

Answer 17

so there are 5 half filled orbitals in a manganese atom?

Answer 18

yes
there are 5