Mathematics, 27.09.2020 22:01, paigejosie6473

What was observed that led to the arrangement of sixty-three already-known elements by increasing atomic weights in the periodic table? A. A repetition occurs in chemical and physical properties.
B. An atomic weight corresponds to the existing abundance.
C. The number of neutrons and protons increased by one.
D. The chemical compounds formed by the elements increased by one.

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What was observed that led to the arrangement of sixty-three already-known elements by increasing at...