How accurate is this classification of matter [duplicate]








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[What is the definition of of 'compound', 'mixture', 'element' and 'molecule'?](/questions/2879/what-is-the-definition-of-of-compound-mixture-element-and-molecule)

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I've recently been starting to study chemistry.
This is how my textbook depicts classification of matter on a macroscopic level.
[![classification of matter](https://i.stack.imgur.com/o68Xc.jpg)](https://i.stack.imgur.com/o68Xc.jpg)


After seeing this, I was confused because wouldn't the mixtures, be it either homogeneous or heterogeneous, consist of either elements or compounds or both too? 


Please help me clarify. 




Heterogeneous and homogeneous mixtures consist of *many elements or compounds*. For example, salt solution is a homogeneous mixture. It is made up of compounds-sodium chloride and water; the elements in this homogeneous mixture are Na, Cl, H, O. 


The sub-classification of pure substances-elements or compounds is based on elements and compounds in their pure state. Na, Cl, H or O will independently fall under the category of elements. Water and sodium chloride will independently fall under the category of compounds. 


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