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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?
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An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d
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The atomic number of an element X is 15 . what would be the valency of X...
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