Skip to main content

Rules For Filling Electrons In Orbitals Notes For NCERT Chemistry Class 11

Rules For Filling Electrons In Orbitals Notes For NCERT Chemistry Class 11
For L- orbit, n = 2, l can have two values (= 0 and 1 which corresponds to s and p sub shells respectively), m will have three values (=-1, 0, +1) which corresponds to three orbitals of p sub shell and s can have two values +1/2 or -1/2. From this information, following combination will be obtained:
  1. n = 2; l = 0; m = 0; s = +1/2
  2. n = 2; l = 0; m = 0; s = -1/2
  • n = 2; l = 1; m = -1; s = +1/2
  1. n = 2; l = 1; m = 0; s = +1/2
  2. n = 2; l = 1; m =+1; s = +1/2
  3. n = 2; l = 1; m = -1; s = -1/2
  • n = 2; l = 1; m = 0; s = -1/2
  • n = 2; l = 1; m =+1; s = -1/2
Therefore, L orbit where n = 2 can accommodate total of eight electrons, two in s sub shell and six in p sub shell. Likewise, the M orbit with n = 3 can accommodate 18 electrons; 2 in s sub shell (l = 0), 6 in p sub shell (l= 1) and 10 in d sub shell (l= 2).
As we pass from one element to another (one of next higher atomic number), one electron is added every time to the atom.
Remember:
  • The maximum number of electrons in any orbit or shell is 2n2, where n is a principal quantum number or the number of the orbit.
  • The maximum number of electrons in a subshell (s, p, d or f) is equal to 2(2l + 1), where l is an azimuthal quantum number) and has the value 0, 1, 2 or 3. Thus, these subshells can have a maximum of 2, 6, 10 and 14 electrons respectively.
  • Orbitals are filled up in order of their increasing energy. The orbital with lower energy is filled up first, then the orbital with higher energy starts filling up. A new electron enters the orbital where (n + l) is minimum. When (n + l) has the same value for two or more orbitals, the new electron enters the orbital where n is minimum. 
Continue complete chapter click Rules For Filling Electrons In Orbitals Notes 
For more Chemistry notes for Class 11, 11th Science, NCERT solutions Class 11th, CBSE guide, sample papers, latest updates from CBSE Board, enroll with TakshilaLearning.

Labels:

Comments

Post a Comment

Thank you we will contact ASAP.

Popular posts from this blog

Why is Hindi Day celebrated on 14 September?

Why is Hindi Day celebrated on 14 September? After independence, the Government of India set a goal to give an ideal form to the mother tongue of the country and set a target for grammar and orthography using the Devanagari script to bring standardization in writing. Subsequently, on September 14, 1949, the Constituent Assembly decided by a vote that Hindi would be the official language of India. To propagate the importance of this decision and to spread Hindi in every region, India is celebrating Hindi Day every year from 1953 to 14 September, at the request of Rashtrabhasha Prachar Samiti, Wardha. Apart from this, 14 September is also the birthday of Rajendra Singh, who worked tirelessly to make Hindi the official language of India. Hindi Day is observed every year on 14 September to mark the importance of the Hindi language in the country. The Hindi language is one of the oldest languages, which derives most of its academic vocabulary from the Sanskrit language written in the Deva
Post a Comment
Read more

Magnetic and non-magnetic material Class 6 Science

Magnetic and non-magnetic material  Class 6 Science A magnet is a substance that is drawn to certain magnetic materials like iron, cobalt, and nickel. Magnets have the ability to draw iron to them. Natural magnets are rocks that naturally draw iron. Non-magnetic materials include things like wood, rubber, coins, feathers, leather, etc. that are not drawn to iron. Magnet characteristics It pulls magnetic materials, such as iron. The magnet's two ends are referred to as its poles. The magnet's diametrically opposed poles are drawn together. Heating, hammering, or dropping causes it to lose its characteristics. On the basis of properties types of Magnets Temporary magnets are those magnets that are magnetic for only a little duration. Typically, iron, cobalt, or nickel are used to make them. When they are close to the powerful magnet, they act like a magnet. When they are yanked away from the powerful magnet, they stop being magnetic. Permanent magnets are magnets that have magne
Post a Comment
Read more