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stability
A mixture.
Compound?
Properties
When elements combine chemically compounds are formed. For instance, when hydrogen and oxygen gases chemically combine, water is formed. Note that if a molecule is made up of only one element, it is referred to as an element, not a compound.
These elements will not combine chemically.
stability
compound is when two or more elements combine chemically
Elements chemically combine to make molecules.
Compound?
yes
Their chemical composition
Compound
sodium and helium
A mixture.
No. helium is chemically inert and does not combine with other elements.
Properties