For Group 13–17 elements in the third row of the periodic table
a...

Question

For Group 13–17 elements in the third row of the periodic table
and beyond, the octet rule is often not obeyed. A friend
of yours says this is because these heavier elements are more
likely to make double or triple bonds. Another friend of
yours says that this is because the heavier elements are larger
and can make bonds to more than four atoms at a time.
Which friend is more correct?

Accepted Answer

insert step 1\u003e Consider the octet rule, which states that atoms tend to form bonds until they are surrounded by eight electrons in their valence shell. This rule is most applicable to the second row elements.. insert step 2\u003e Recognize that for elements in the third row and beyond, the octet rule is often not strictly followed. This is due to the availability of d orbitals, which can accommodate more than eight electrons.. insert step 3\u003e Evaluate the first friend's statement: Heavier elements can form double or triple bonds. While this is true, it is not the primary reason for the octet rule's exceptions. Double and triple bonds are more about bond strength and stability rather than exceeding the octet.. insert step 4\u003e Evaluate the second friend's statement: Heavier elements are larger and can bond with more than four atoms. This is more accurate because larger atoms have more available orbitals (including d orbitals) that can participate in bonding, allowing them to expand their valence shell beyond eight electrons.. insert step 5\u003e Conclude that the second friend is more correct. The ability of heavier elements to expand their valence shell and form bonds with more than four atoms is a key reason why the octet rule is not strictly followed for these elements.

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Octet Rule

Bonding in Heavier Elements

Coordination Number