1.) what is the ground state electron configuration of fe?
how many valence electrons does iron have?
how many unpaired electrons are in the ground state of fe?
2.) write out the electron configurations of the following atoms using an inert gas core. for each atom, give the orbital that will have the valence electron that will experience the smallest effective nuclear charge? which will experience the greatest zeff?
1. s
2. cu
3.) which electron configuration violates hund's rule? which violates the pauli exclusion principle? which violates both?
1s 2s 2p
i. (↑↓) (↑↓) (↑ ) ( ) ( )
ii. (↑↓) (↑↓) (↑ ) (↑ ) ( )
iii. (↑↓) (↑↓) (↑↓) (↑ ) ( )
iv. (↑↓) (↑↑) (↓ ) (↓ ) ( )
v. (↑↓) (↑↓) (↑↑) (↑ ) ( )

i believe the answer is a.

increased stability in the completion of fluorine's outer shell.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2