* First Shell (n=1): The first shell can hold a maximum of 2 electrons.
* Second Shell (n=2): The second shell can hold a maximum of 8 electrons.
* Third Shell (n=3): The third shell can hold a maximum of 18 electrons.
Explanation:
The number of electrons that can occupy a shell is determined by the following:
* Principal Quantum Number (n): This number represents the energy level of the shell. The higher the 'n' value, the higher the energy level.
* Subshells: Within each shell, there are subshells (s, p, d, f) with different shapes and energy levels.
* Orbitals: Each subshell contains orbitals, which are regions of space where electrons are likely to be found. Each orbital can hold a maximum of 2 electrons.
Here's a breakdown for the first three shells:
* Shell 1 (n=1): Has only one subshell, the 's' subshell, which contains 1 orbital. So, it can hold a maximum of 2 electrons (1 orbital x 2 electrons per orbital = 2 electrons).
* Shell 2 (n=2): Has two subshells: 's' (1 orbital) and 'p' (3 orbitals). This gives a total of 4 orbitals (1 + 3 = 4). Therefore, it can hold a maximum of 8 electrons (4 orbitals x 2 electrons per orbital = 8 electrons).
* Shell 3 (n=3): Has three subshells: 's' (1 orbital), 'p' (3 orbitals), and 'd' (5 orbitals). This gives a total of 9 orbitals (1 + 3 + 5 = 9). Therefore, it can hold a maximum of 18 electrons (9 orbitals x 2 electrons per orbital = 18 electrons).
