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How many half-filled orbitals are there in a manganese (atomic number 25) atom? A. 4 B. 1 C. 5 D. 3 E. 2

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Is B the correct answer?
no. its not, write the electronic config.
1s2 2s2 2p6 3s2 3p6 3d5 4s2

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the complete electronic configuration
is this correct?
absolutely. correct. gd!
now how many unpaired electrons are there
can you explain how to know how many unpaired electrons there are?
except for 3d, each orbital has even number of electrons, which implies paired electrons. do you know how many orbitals are there in d
5 orbitals?
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,
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)
any difficulty.?
I think I understand now. but how do you know which rule to use to find half-filled orbitals?
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
Ok!!! Thanks a lot!
so there are 5 half filled orbitals in a manganese atom?
yes there are 5

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