Question

Why 2n^2 = number of electrons in that shell

Answer 1

Answer:

that is the formula

Explanation:

it cannot be explained

Answer 2

Electronic Configuration of Elements

According to the postulate of Neils Bohr, “electrons revolve around the centre of an atom (nucleus) in a predictable pathway named orbits”. The representation of the orbits is done by letters and numbers such as K, L, M, N, O…. and 1,2,3,4…. respectively. The arrangement and distribution of electrons in different orbits was given by Bohr and Bury.

The arrangement of electrons in different shells and sub-shells is known as the electronic configuration of a particular element. The electronic configuration diagram represents an element in its ground state or stable state. There are a set of rules to remember while distribution off electrons in different orbits.

• Rule 1: The maximum number of electrons present in a particular shell is calculated by the formula 2n², where “n” represents the shell number. For instance, K shell is the first shell and it can hold up to 2(1)²=2 electrons. Similarly, L shell is the second shell and it can hold up to 2(2)²=8 electrons. This formula helps to calculate the maximum number of electrons that an orbit can accommodate.

• Rule 2: The maximum capacity to hold electrons in the outermost shell is 8.

• Rule 3: The electrons will fill the inner shells before the outer shells. First electrons will fill the K-shell and then L shell and so on. Thus, electronic configuration of elements follows an ascending order.