Chemistry
What are transition elements and inner transition elements. State the position of the inner transition elements. State why noble gases are considered unreactive elements.
Periodic Table
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Answer
Transition Elements — Elements belonging to Groups 3 to 12 are called transition elements. The valence electron of these elements is in d orbital. They are metals and lie between strongly electropositive metals on the left and least electropositive elements on the right. They all have similar properties.
Inner Transition Elements — Elements belonging to Group 3 in 6th and 7th period are called Inner transitional elements. The valence electron of these elements is in f orbital. They consists of two horizontal rows of elements which are placed at the bottom of the table. These rows are called Lanthanides (rare earth) and Actinides (radio active). Each row has 14 elements.
Noble gases are unreactive because their octet is complete and they have a stable electronic configuration.
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