To determine the oxidation numbers of each atom in the given substances, we will apply the rules for assigning oxidation states. Here are the results for each substance:
-
NF₃:
N: +3
F: -1 -
K₂CO₃:
K: +1 (each)
C: +4
O: -2 (each) -
HIO₄ (periodic elements may vary, but common assignments apply):
H: +1
I: +7
O: -2 (each) -
Br₂:
Br: 0 (element in its natural form) -
2NaI:
Na: +1 (each)
I: -1 -
I₂:
I: 0 (element in its natural form) -
2NaBr:
Na: +1 (each)
Br: -1 (each) -
Fe₂O₃:
Fe: +3 (each)
O: -2 (each) -
2Al:
Al: 0 (element in its natural form) -
Al₂O₃:
Al: +3 (each)
O: -2 (each) -
2Fe:
Fe: 0 (element in its natural form)
These oxidation numbers follow the standard rules regarding oxidation states, including the common oxidation states seen for elements such as oxygen, halogens, alkali metals, etc.
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