Question

what is electronic configuration ? state the rules for distribution of electrons in different shell​

Answer 1

Electronic configuration

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation explained below. 

Rules :-

The electrons are arranged around the nucleus in different energy levels or energy shells. The electrons first occupy the shell with the lowest energy i.e., closest to the nucleus.

The first or the innermost energy shell (K or n = 1) can take only two electrons.

The second shell (L or n = 2) can contain upto 8 electrons.

From third shell (M or n = 3) onwards, the shells become bigger. The third shell can accommodate as many as 18 electrons. In general, the maximum number of electrons that can be present in any shell is 2n2 where n is the number of energy shell. Thus, the first orbit (n = 1, known as K shell) can contain 2 × 12 = 2 electrons, the second orbit (n = 2, known as L shell) can contain 2 × 22 = 8 electrons.

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Answer 2

Answer:

Electronic configuration is the distribution of electrons in different shells. The shells are K,L,M,N..

Explanation:

Rules:

-maximum number of electrons that K shell can hold are 2.

-L shell can hold 8 electrons maximum.

-W eneed to know the atomic number for getting the electronic configuration.

- The formula to know how many electrons can fit each shell is 2n^2, where n is the shell's number.

- Example: Sodium(Na)- atomic number(11)- electronic configuration is 2,8,1 (2+8+1=11)

Hope this helps :)