Question

The element with fully-filled K shell but a half-filled L shell is __________

Answer 1

1. In atomic structure, electrons are arranged in the shell. Each shell is labelled by letters (K, L, M, N,…), and it can hold a specific number of an electron.
2. The K shell can hold two electrons.
3. The L shell can hold eight electrons.
4. An element with completely filled K shell (2 electrons) and a half-filled L shell (4 electrons) will have the atomic number 6. The element with atomic number 6 is Carbon (C).
5. Hence, carbon is an element with a fully-filled K shell and a half-filled L shell.