Among the following molecules octet rule is not obeyed by: 0; Chemistry ; The central atom of ClF 3 has more than eight electrons in its valence shell and forms super octet molecule. There are even more occasions where the octet rule does not give the most correct depiction of a molecule or ion. The Lewis structure of the borate ion, BO₃³⁻ is drawn in a form that violates the octet rule for B. 3)N3− 4)CH2Cl2. Share ; Comment(0) Add Comment. A friend of yours says this is because these heavier elements are more likely to make double or triple bonds. But elements in periods 3→6 do form compounds in which the central atom has more than eight electrons around it, most common being 10 or 12. This is also the case with incomplete octets. In a molecule of phosphorus pentachloride, #PCl_5#, each chlorine atom ends up with an octet of electrons (four pairs), but the phosphorus atom ends up with ten electrons (five pairs). Hyper valence: • The octet rule is obeyed by elements in period 2 (Li → Ne) strictly. 4. For elements in the third row of the periodic table and beyond, the octet rule is often not obeyed. Check all that apply. There are three categories of molecules that don't follow the octet rule: 1) Lewis Structures that have an odd number of valance electrons. 5)[SnF6]2− Identify the ions and molecules in which the octet rule is not obeyed. Molecules that combine to have an odd number of valence electrons don't follow the octet rule. 1)PH3. The octet rule is one of the chemical “rules of thumb” stating that atoms prefer to combine in a manner such that each atom has 8 electrons in their valence shells. 2)AlH3. Species with incomplete octets are pretty rare and generally are only found in some beryllium, aluminum, and boron compounds including the boron hydrides. The other halogen molecules (F 2, Br 2, I 2, and At 2) form bonds like those in the chlorine molecule: one single bond between atoms and three lone pairs of electrons per atom.This allows each halogen atom to have a noble gas electron configuration, which corresponds to eight valence electrons. Draw a single Lewis structure for the phosphate ion (PO43−), in which the octet rule is obeyed. • In such cases the octet rule is broken, not obeyed. This is because: a. Boron, being in group 3A of n = 2, can only accommodate 3 chemical bonds b. There are an insufficient number of total electrons available for all the atoms in the borate ion to have an octet Include all formal charges and lone-pair electrons. Some examples of these include: Hydrogen (H) in H 2. Draw the Lewis structures for each of the following molecules or ions. One exception to the octet rule is that in the real world some atoms in molecules or compounds do have fewer than eight (octet) valence electrons. 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