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Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?