anonymous
  • anonymous
How many half-filled orbitals are there in a manganese (atomic number 25) atom? A. 4 B. 1 C. 5 D. 3 E. 2
Chemistry
katieb
  • katieb
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anonymous
  • anonymous
Is B the correct answer?
anonymous
  • anonymous
no. its not, write the electronic config.
anonymous
  • anonymous
1s2 2s2 2p6 3s2 3p6 3d5 4s2

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

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