Chemists use symbols and formulae to represent elements and compounds. Word equations and balanced chemical equations represent the changes that happen in chemical reactions.
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:
Some non-metal elements exist as molecules that are made up of two atoms joined together. The formulae of these elements are the element's symbol followed by a subscripted '2'. For example:
A mnemonic can be used to remember these elements:
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What are the chemical formulae of the elements neon, nitrogen and sodium?