What is a mixture, compound and element
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A pure chemical substance consisting of two or more different chemical elements.

A substance consisting one type of atom.

A mixture that consists of visibly different substances or phases.

Element: The atoms of an element are similar in their properties. For example iron, copper, aluminum, gold, etc.

Compound: When two or more atoms combine through a chemical reaction in a fixed ratio, a compound is formed. For example, sugar, glass, salt, soap, etc.

A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally