Draw the Bohr model of any element from hydrogen to xenon. See concentric electron shells with K, L, M, N labels, per-shell electron counts, and a step-by-step fill.
The Bohr Model Diagram draws the electron shell structure of any element from hydrogen through xenon, or any of their common ions. Enter a symbol like Na or Cr and see the concentric shells fill, with each step explained.
Shell totals come from a real Aufbau subshell walk — not a naive 2n² fill — so post-argon elements like calcium (2, 8, 8, 2) and the chromium exception (2, 8, 13, 1) come out right.
A Bohr model (shell diagram) shows an atom's electrons on concentric rings around the nucleus. Each ring is a shell labeled K, L, M, N... holding at most 2n² electrons.
The capacity is 2n²: 2 in the K shell, 8 in L, 18 in M, and 32 in N. The outermost shell usually holds fewer than its capacity — those are the valence electrons.
Electrons fill subshells in energy order and 4s fills before 3d, so calcium's fourth shell starts while its third holds only 8. Filling each shell to capacity independently gives wrong answers past argon.
Chromium is an Aufbau exception: one 4s electron moves into 3d for a more stable half-filled subshell, giving shells of 2, 8, 13, 1 instead of the naive 2, 8, 12, 2.
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