Electronic configurations of atoms for atoms having atomic no 1 to 20

Electronic Configuration of Atoms (Atomic Number 1 to 20)

Electronic configuration is the arrangement of electrons in different energy levels or shells around the nucleus of an atom. The distribution of electrons follows a rule known as the 2n² rule.

What is the 2n² Rule?

According to the 2n² rule, the maximum number of electrons that can be filled in a shell is calculated by the formula:

The maximum number of electrons a shell can hold is given by the formula: 2n²

Here, n is the number of the shell (1 for K, 2 for L, 3 for M, and so on).

Electron Capacity per Shell:

• K shell (n = 1): Can hold up to 2 electrons (2 × 1² = 2)
• L shell (n = 2): Can accommodate a maximum of 8 electrons (2 × 2² = 8)
• M shell (n = 3): Has a capacity of 18 electrons (2 × 3² = 18)
• N shell (n = 4): Can contain up to 32 electrons (2 × 4² = 32)

Electronic Configuration of Elements (Atomic Number 1 to 20)

The electronic configuration helps us understand how electrons are arranged in an atom. Using the 2n² rule, we can easily determine how many electrons fit into each shell, making it easier to study the structure and properties of elements.