When a lever is balanced, which expression is true? torque (ccw) = torque (cw)
torque (ccw) > torque (cw)
torque (ccw) < torque (cw)

It will fall off and tip over. 

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Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.