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Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.