What were elements characterized by in
the 1860's
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Ответ:
Döbereiner singled out triads of the elements lithium, sodium and potassium as well as chlorine, bromine and iodine. He noticed that if the three members of a triad were ordered according to their atomic weights, the properties of the middle element fell in between those of the first and third elements.
Explanation:
Ответ:
A compound is a pure substance because its molecules cannot be broken.
Explanation:
A compound composed of elements chemically combined together. So its molecules cannot be broken down by ordinary process.