atomic structure

atomic structure

1. All substances are made from tiny particles called atoms. An atom is the smallest part of an element that can exist.

2. A chemical formula is used to represent an element or compound in balanced chemical equations. The formula for most elements is just its chemical symbol. For example: helium, He lithium, Li beryllium, Be boron, B carbon, C neon, Ne sodium, Na magnesium, Mg

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