Sb (antimony) has 51 electrons.
Its noble gas notation is [Kr] 4d10 5s2 5p3
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There is no boble gas notation for hydrogen and helium. The noble gas notation starts for elements after helium. The noble gas notation is a notation formed as a result of the electron configuration notation being used in conjunction with noble gases. The noble gas preceding the element in question is written then the electron configuration is continued from that point forward.
The noble gas notation starts for elements after helium. Helium has no noble gas notation. Its electronic configuration is 1s2
Noble-gas notation is a shorthand way of representing the electron configuration of an element by using the nearest noble gas that precedes the element in the periodic table. The noble-gas notation simplifies electron configuration by replacing the inner electron configuration with the symbol of the nearest noble gas and then representing the remaining electrons.
The noble gas notation for Berkelium (Bk) is [Rn] 5f^9 7s^2.
The noble gas notation for carbon uses neon as the previous noble gas. Carbon ([He] 2s^2 2p^2) can be written in noble gas notation as [He] 2s^2 2p^2.