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Atomic mass is the total mass of neutrons and protons in a certain isotope. It is usually called: AMU or atomic mass unit.
Mass number is the number of protons and neutrons in an atom, and it tells us about the mass of the atom in amu, or atomic mass units. Atomic mass is the average mass of all the isotopes of a certain type. It is a weighted average that takes into account the abundances of all of the different isotopes
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It is not directly over a flame because it depends on the substance you might not want to heat it too much.you never know what could happen
Answer:
A device designed to transmit electromagnetic waves through the air should be developed.
