Question

Is it 8 or 18 electrons in third shell?

Answer 1

Answer:

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. ... For an explanation of why electrons exist in these shells see electron configuration