Select the correct answer. sample taken from a layer of mica in a canyon has 2.10 grams of potassium-40. A test reveals it to be 2.6 billion years old. How much
potassium-40 was in the sample originally if the half-life of potassium-40 is 1.3 billion years?
OA. 4.20 g
© B.
8.40 g
O c.
12.6 g
O D.
16.8 g
O E. 25.2 g
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Figure 10-1 study figure 10-1. the strong nuclear force felt by a single proton in a large nucleus

The p sub shell can hold up to 8 electrons in an atom. true or false?

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm