Question

what are the common characteristics of all atom of an element, according to the atomic theory?​
how can I follow ​

Answer 1

Answer:

Atoms themselves are composed of protons, neutrons, and electrons. Each element has its own atomic number, which is equal to the number of protons in its nucleus. Isotopes of an element contain different numbers of neutrons. Elements are represented by an atomic symbol.

Answer 2

Answer:

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