- Why is 3rd shell 8 or 18?
- Can an atom make 8 bonds?
- Which group has different numbers of valence electrons?
- Why are there 18 electrons in the third shell?
- Why are there only 8 electrons in the outer shell?
- Can atoms have more than an octet of valence electrons?
- Which one will have the maximum number of valence electrons?
- What is the maximum number of electrons in a shell?
- Why does sulfur have 12 valence electrons?
- Can there be more than 8 valence electrons?
- How many valence electrons are in an atom of nitrogen?
- What is the 2 8 8 rule in chemistry?
- Why can Xenon have more than 8 valence electrons?
- Why can an atom only have 8 valence electrons?
- Why are shells named KLMN?
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..
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 group has different numbers of valence electrons?
The number of valence electrons With the exception of groups 3–12 (the transition metals), the units digit of the group number identifies how many valence electrons are associated with a neutral atom of an element listed under that particular column.
Why are there 18 electrons in the third shell?
The 3rd subshell consists of an s orbital , a set of (3)p orbitals and a set of (5)d orbitals. Each orbital holds 2 electrons and you will indeed find that you can fir 18 electrons in. … This is because it is the maximum capacity of the 3rd shell and it doesn’t tell about the order in which the electrons are filled.
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.
Can atoms have more than an octet of valence electrons?
Compounds with more than an octet of electrons around an atom are called expanded-valence molecules. One model to explain their existence uses one or more d orbitals in bonding in addition to the valence ns and np orbitals. … Molecules in which one or more atoms possess more than eight electrons, such as SF6; and.
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 maximum number of electrons in a 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. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.
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.
Can there be more than 8 valence electrons?
octet rule: Atoms lose, gain, or share electrons in order to have a full valence shell of eight electrons. Hydrogen is an exception because it can hold a maximum of two electrons in its valence level.
How many valence electrons are in an atom of nitrogen?
5 valence electronsNitrogen has a total of 5 valence electrons, so doubling that, we would have a total of 10 valence electrons with two nitrogen atoms. The octet requires an atom to have 8 total electrons in order to have a full valence shell, therefore it needs to have a triple bond.
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 can Xenon have more than 8 valence electrons?
Xe does not follow the octet rule. It actually bonds. … Xenon having valence electrons in the 4th energy level, will also have access to the 4d sublevel, thus allowing for more than 8 electrons. XeF4 is d2sp3 hybridized and contains 2 lone pair and 4 bonding pairs of valence electrons around the Xenon.
Why can an atom only have 8 valence electrons?
A complete octet is very stable because all orbitals will be full. Atoms with greater stability have less energy, so a reaction that increases the stability of the atoms will release energy in the form of heat or light. A stable arrangement is attended when the atom is surrounded by eight electrons.
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.