Longer than visable light
Well a question to ask would be if the mass of the material has changed significantly as that would determine that the substance is radioactive or if there have been any high readings found by a Geiger meter in certain period of time
hope that helps
Answer:
b
Explanation:
A pure substance has a constant composition and cannot be separated into simpler substances by physical means. There are two types of pure substances: elements and compounds.
A.)Neutral. Since amount of protons and electron are equal and amount of protons cannot be changed so it is stable or neutral.
I think it’s to long to fit in a period??
