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Answer:
Check the explanation
Explanation:
The total reaction when it comes to a three-reaction system can be endothermic, that is when two of the reaction is exothermic although it is very rare since the 2 exothermic reactions will have to be of smaller size combined H° than that of the endothermic reaction. If that action is absent then the reaction cannot be endothermic.
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Answer:
Option d. f sublevel
Explanation:
Inner transition elements includes:
Lanthanides
Actinides
Lanthanides includes elements having atomic number ranges from 52-71.
Actinides includes elements having atomic number ranges from 89-103.
Actinides and lanthanides have been placed separately in two rows below all the other elements.
General electronic configuration of lanthanides:
General electronic configuration of actinides:
As last electrons enters in f sub shell or sublevel, these elements are also called f-block elements.