Can The Third Shell Hold 8 Or 18 Electrons?

Why does scandium have 9 electrons in the third shell?

Scandium is the first element of the period table where electron configurations start getting a little wild.

Every element adds one more electron to the outermost shell.

Instead of having three electrons in the outer shell, scandium adds its electron to the second to last shell.

The electron configuration is 2-8-9-2..

Why can the third energy level hold 18 electrons?

Electrons in this orbital are called s electrons and have the lowest energy of any electrons in that principal energy level. … The five d orbitals can hold up to 10 electrons. Thus, the third level holds a maximum of 18 electrons: 2 in the s orbital, 6 in the three p orbitals, and 10 in the five d orbitals.

Why are shells named KLMN?

The names of the electron shells come from a fellow named Charles G. Barkla, a spectroscopist who studied the X-rays that are emitted by atoms when they are hit with high energy electrons. … This innermost shell is now called the K-shell, after the label used for the X-ray.

Why does the third shell have 8 electrons?

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.

How many electrons does the third shell hold?

eight electronsThe innermost shell is filled first. This shell can contain a maximum of two electrons. The second shell can hold a maximum of eight electrons. When this is filled, electrons go into the third shell, which also holds a maximum of eight electrons.

How many electrons can the 4 Shell hold?

Search formShellSubshellTotal Number of Electrons in Shell1st Shell1s22nd Shell2s, 2p2 + 6 = 83rd Shell3s, 3p, 3d2 + 6 + 10 = 184th Shell4s, 4p, 4d, 4f2 + 6 + 10 + 14 = 32

Why do atoms want 8 electrons?

Row 3 elements on the left lose electrons to gain a full outer shell, elements on the right usually gain electrons to have 8 electrons in their outer shell. The basis of the octet rule is that atoms ‘want’ a full outer shell of electrons, i.e. they are most stable with a full outer shell.

What is the highest occupied energy level?

What is it meant by the highest occupied energy level in an atom? The highest occupied energy level in an atom is the electron-containing main energy level with the highest number.

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.

Can the third Shell hold 18 electrons?

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. … The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

Why outermost shell Cannot have more than 8 electrons?

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 can sulfur have more than 8 electrons?

Its structure is Here the sulfur atom has six electron pairs in its 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. … An octet would be 3s23p6.

Can two electrons be in the same shell?

The state of a system is completely described by a complete set of quantum numbers. … The Pauli exclusion principle says that no two electrons can have the same set of quantum numbers; that is, no two electrons can be in the same state. This exclusion limits the number of electrons in atomic shells and subshells.

Can there be more than 8 electrons in a shell?

Unlike atoms from periods one and two that only have the s and p orbitals (total of 8 valence electrons), atoms like phosphorus, sulfur, and chlorine can have more than 8 electrons because they are not restricted to the s and p orbitals and have a d orbital for additional electrons needed for bonding.

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!