Question: Why Can XE Have More Than 8 Valence Electrons?

Can an atom have more than 8 valence electrons?

Sulfur, phosphorus, silicon, and chlorine are common examples of elements that form an expanded octet.

Phosphorus pentachloride (PCl5) and sulfur hexafluoride (SF6) are examples of molecules that deviate from the octet rule by having more than 8 electrons around the central atom..

Which elements can hold more than 8 valence electrons?

Sulfur, phosphorus, silicon, and chlorine are common examples of elements that form an expanded octet. Phosphorus pentachloride (PCl5) and sulfur hexafluoride (SF6) are examples of molecules that deviate from the octet rule by having more than 8 electrons around the central atom.

Can an atom make 8 bonds?

The ability to use the d subshell is what makes it possible for atoms to go beyond the octet, and it’s also why atoms up to the second period cannot do that. For that same reason, six or seven bonds are possible, and Xenon can form 8 covalent bonds in the compound XeO4!

Which one will have the maximum number of valence electrons?

Thus, phosphorus has the maximum number of valence electrons, i.e., 5.

What is the 2 8 8 rule in chemistry?

There is a 2-8-8 rule for these elements. The first shell is filled with 2 electrons, the second is filled with 8 electrons, and the third is filled with 8. You can see that sodium (Na) and magnesium (Mg) have a couple of extra electrons. They, like all atoms, want to be happy.

Why are there 32 electrons in the 4th Shell?

In my textbook, it says that the maximum number of electrons that can fit in any given shell is given by 2n². This would mean 2 electrons could fit in the first shell, 8 could fit in the second shell, 18 in the third shell, and 32 in the fourth shell.

How many valence electron does Xe have?

eight valence electronsXenon right over here. It is a noble gas. It has eight valence electrons.

Why are there only 8 electrons in the outer shell?

The shells of an atom cannot accommodate more than 8 electrons, even if it has a capacity to accommodate more electrons. This is a very important rule called the Octet rule. According to this rule, atoms gain, loose or share electrons to achieve the stable configuration similar to the nearest noble gas.

Why do transition metals have 2 valence electrons?

Most transition metals have 2 valence electrons. Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). … Chromium has an electron configuration of [Ar]4s13d5 because having a half filled 3d subshell is more stable, so it has one valence electron.

Why is 3rd shell 8 or 18?

The third shell of an atom has 18 electrons only not 8 electrons. You might be confused because first the electrons of 4s are filled and then the 10 electrons of 3d shells are filled. They are filled because of the n-l rule. … So after filling the 3s and 3p subshell with 8 electrons, the next shell to fill is the 4s one.

What does it mean if an element has 8 valence electrons?

Atoms of group 18 elements have eight valence electrons (or two in the case of helium). These elements already have a full outer energy level, so they are very stable. As a result, they rarely if ever react with other elements. … Therefore, it is very reactive and gives up electrons in chemical reactions.

Why does sulfur have 12 valence electrons?

Sulfur has one more electron pair in its 3s subshell so it can undergo excitation one more time and place the electron in another empty 3d orbital. Now sulfur has 6 unpaired electrons which means it can form 6 covalent bonds to give a total of 12 electrons around its valence shell.

Are there 8 or 18 electrons in the third shell?

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.

Why can sulfur have more than 8 valence electrons?

To accommodate more than eight electrons, sulfur must be using not only the ns and np valence orbitals but additional orbitals as well. Sulfur has an [Ne]3s23p43d0 electron configuration, so in principle it could accommodate more than eight valence electrons by using one or more d orbitals.

Why can Xe have an expanded octet?

Xenon now has twelve electrons instead of the octet! This is called an “expanded octet”, expanding beyond the octet. … In the structure shown above, Xe has a formal charge of zero, so there is no reason to do any more to the structure.