half-life, Chemistry

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just explain a little bite of its sequence that why uranium is used

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The expression for bohr''s radius of an atom is, The expression for Bohr's ...

The expression for Bohr's radius of an atom is: (1) r= n 2 h 2 / 4 Π 2 me 4 z 2                         (2) r= n 2 h 2 / 4 Π me 2 z 2           (3) r=  n2h2/4 Π me 3

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While studying evolution, a student comes across a cladogram that includes clades like amphibia, reptilia, aves, and mammalia. What must be the basal clade?

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