The octet rule can be 'expanded' by some elements by utilizing the d-orbitals found in the third principal energy level and beyond. Sulfur, phosphorus, silicon, and chlorine are common examples of elements that form an expanded octet.

Which periods can have expanded octets?

An element from Period 3 and below will be able to expand octet by making use of its energetically accessible, or low lying d-subshell for bonding. This means only Period 2 elements such as C, N, O and F cannot expand octet and have to obey octet rule.

Where do atoms form octets?

Octet, in chemistry, the eight-electron arrangement in the outer electron shell of the noble-gas atoms. This structure is held responsible for the relative inertness of the noble gases and the chemical behaviour of certain other elements.

Which of the following molecules contains an atom with an expanded octet?

(1 bond × 2 e^–) + (3 lone pairs × 2 e^–) = 8 electrons. (2 bonds × 2 e^–) + (3 lone pairs × 2 e^–) = 10 electrons. This is more than 8 which means chlorine has an expanded octet.

Why do expanded octets occur?

A hypervalent molecule is a molecule that contains one or more main group elements that bear more than eight electrons in their valence levels as a result of bonding. ... Therefore, the d orbitals participate in bonding with other atoms and an expanded octet is produced.

Expanded Octet

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Which elements should never have expanded octets?

These elements include hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon. Elements that cannot have an expanded octet are: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon.

Does SF2 follow the octet rule?

SF2, SF4, SF6, SO2. The compounds in which S do not obey octet rule are SF4, SF6 and SO2. ... SF4 , S do not obey octet rule in case of SF4. Sulphur atom has six electrons in the valence shell.

Why do atoms form octets?

The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. ... Atoms of metals tend to lose all of their valence electrons, which leaves them with an octet from the next lowest principal energy level.

What is the element with 16 electrons?

In order to write the Sulfur electron configuration we first need to know the number of electrons for the S atom (there are 16 electrons). When we write the configuration we'll put all 16 electrons in orbitals around the nucleus of the Sulfur atom.

What is octet rule class 10th?

The octet rule states that the atoms like to have eight electrons only in their full outer shells. For achieving eight electrons in their outer shells, atoms would gain or lose the valence electrons. ... Moreover, these atoms can be the same element or with different elements.

Which atoms would have an expanded valence shell?

An atom like phosphorus or sulfur which has more than an octet is said to have expanded its valence shell. This can only occur when the valence shell has enough orbitals to accommodate the extra electrons. For example, in the case of phosphorus, the valence shell has a principal quantum number n = 3.

Is electronegativity on the periodic table?

On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Why does BCl3 violate the octet rule?

BCl3 do not obey octet rule.It is a electron deficient molecule.As it share only three electron with chlorine atom . After forming a molecule boron has only six electrons I.e three from chlorine atom and three of its own. ... whereas fluorine molecule will be achieving octet by sharing one electron.

How many electrons are needed for atoms in the groups below to complete their octets?

The octet rule is a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

How many electrons are needed for the elements below to complete their octets?

The octet rule states that atoms with an atomic number below 20 tend to combine so that they each have eight electrons in their valence shells, which gives them the same electronic configuration as a noble gas.

How does the octet rule determine the position of an element in the periodic table?

The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds.

Which of the following has an expanded octet?

PF5, SF6 and H2SO4 are the examples of expanded octet molecules.

Which characteristics is needed for an atom to have an expanded octet?

Some atoms are exceptions to the octet rule by having an expanded octet. Which characteristic is needed for an atom to have an expanded octet? The atom has empty d-orbitals. How many valence electrons are available for bonding in silicon?

How many of the following elements can form compounds with an expanded octet?

In the following question, only three elements will have the expanded octet.

Which elements can have expanded octets quizlet?

Elements in the third row and beyond in the periodic table often exhibit expanded octets. Elements in the first and second rows should never have expanded octets.

Which elements should never have expanded octets chegg?

Elements in the third row of the periodic table never have expanded octets. Elements in the fourth row of the periodic table never have expanded octets.

What is an expanded octet quizlet?

expanded octets: molecules or ions with more than 8 electrons around atom (ex. AsF5)