When Bismuth-211 decays by emitting an alpha particle, a helium molecule is released together with the new element.
for alpha particle 4He2
4 = mass number
2 = atomic number
Bismuth has an atomic number of 83 therefore the new element produced shoud have a mass number of 207 and atomic number of 81.
This corresponds to approximately 207 Tl 81
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Since the troposphere is heated from below, it tends to be colder as you start moving up since the air gets thinner. The sun's heat radiates which causes the air to be "stirred up" which can cause weather changes.
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Answer:
it's a measure of how far down light can penetrate through the water column. ... Because water clarity is closely related to light penetration, it has important implications for the diversity and productivity of aquatic life that a system can support