What is meant by the word chemical, as used by scientists?
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Ответ:
a compound or substance that has been purified or prepared, especially artificially.
brainliest please!! :)
Ответ:
Electrons are not considered.
Explanation:
An electron's mass is around 9.1 * 10^-31 kg, whereas the mass of protons and neutrons is around 1.7 * 10^-27 kg. Since electrons are about 1000x smaller than protons and neutrons, they are not considered to contribute significantly to the atomic mass.