Answer:
Melting point
Explanation:
Pure substances have sharp melting and boiling points while impurities lower the melting point and raise the boiling point
Answer:
a mixture is a material made up of two or more different substances which are physically combined.
17, to be neutral it has to have equal number of protons and electrons
Answer: The number of protons and the number of neutrons determine an element's mass number.
Explanation:
