Why is an element considered a pure substance?
An element is a pure substance because it is made of only one type of atom and has a uniform, definite composition.
What did you include in your response? Check all that apply.
⇒ 13
13
⇒ 7
7
What ion is formed when an atom of mercury (Hg) loses two electrons?
⇒ 13
13
⇒ 5
5
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