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RH
How many half-filled orbitals are there in a manganese (atomic number 25) atom? A. 4 B. 1 C. 5 D. 3 E. 2
no. its not, write the electronic config.
the complete electronic configuration
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
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)
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
so there are 5 half filled orbitals in a manganese atom?