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The answer is A. compound
A compound is a combination of two or more elements or types of atoms chemically
the answer isn't B because a gas isn't a combination of two or more atoms .
it isn't C either because an element is a substance made of only one kind of an atom.
the answer isn't D because reactants are the starting materials in a chemical change
A compound is a combination of two or more elements or types of atoms chemically
the answer isn't B because a gas isn't a combination of two or more atoms .
it isn't C either because an element is a substance made of only one kind of an atom.
the answer isn't D because reactants are the starting materials in a chemical change
Considering the definition of compound, the result of two or more atoms combining chemically is compound.
Definition of compound
A compound is a substance made up of two or more elements from the periodic table.
A chemical compound is made up of molecules or ions that are stably linked, so that they cannot be separated with any treatment or physical process, but only with some chemical method.
Compounds have different physical and chemical properties than those of their constituent elements.
A compound has a fixed composition, represented by a chemical formula.
The chemical formula is made up of symbols and subscripts, the symbols corresponding to those of the elements that form the chemical compound to be formulated and the subscripts with the number of atoms of said elements to achieve molecular stability.
Summary
In summary, the result of two or more atoms combining chemically is compound.
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