Element sembolü yazılırken şu kurallara dikkat edilir: 1. Tek harfli semboller büyük harfle yazılır. 2. İki veya üç harfli sembollerde ilk harf daima büyük, diğer harfler küçük yazılır. Örneğin: - H (Hidrojen). - He (Helyum).
Bazı element sembolleri şunlardır: H - hidrojen; He - helyum; Li - lityum; Be - berilyum; B - bor; C - karbon; N - azot; O - oksijen; F - flor; Ne - neon. Element sembolleri, genellikle elementlerin Latince adlarındaki ilk harflerden oluşur.
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