<span>A. The nucleus can be either positively charged or neutral.
The nucleus is located at the center of an atom wherein it contains the protons and the neutrons.</span>
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Explanation:
Answer:
A flame test is an analytical procedure used in chemistry to detect the presence of certain elements, primarily metal ions, based on each element's characteristic emission spectrum. The color of flames in general also depends on temperature; see flame color.
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B.
I think this is right.
If it is not I apologize
Answer:
Melting and evaporation both represent changes in matter that involve behavior at the molecular level.
