Science
posted by Kalie .
What happens to the mass of a sample containing a radioactive element during its halflife?
A. The mass decreases by half.
B. The amount of mass is doubled.
C. Eventually there is no mass at all.
D. The mass remains the same.

Of course, the mass remains the same for practical purposes. During the release of energy, a very tiny portion of mass is converted to energy, but that mass is extremelyl small, and cannot be determined by ordinary means.
Respond to this Question
Similar Questions

Chemistry
It took 109.8 years for a 300.0 mg sample of an unknown radioactive material to completely disintegrate. Calculate the mass of the element (in grams/mole) assuming that the disintegrations per second are constant over the lifetime … 
Chemistry
Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 10 years? 
CalculusModeling Equations
An unknown radioactive element decays into nonradioactive substances. In 420 days the radioactivity of a sample decreases by 39 percent. 1.What is the halflife of the element? 
Physics HELP HELP
(for some reason I keep getting this wrong. I put 90 for c, 5.6 for h and 22 for M(x), Then I took the natural log of both sides, but I keep getting it wrong) The mass of a radioactive element at time x is given by the equation below, … 
calculus
The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the mass in grams, t is the time in years, and k is a constant. Answer the following. a) If a 100gram sample … 
math30
The mass of a radioactive sample is represented in the graph below. The initial mass of 32 mg decays to 8 mg after 21 hours. 1)What is the halflife of the radioactive sample, in minutes? 
math
An unknown radioactive element decays into nonradioactive substances. In 100 days the radioactivity of a sample decreases by 64 percent. a)(a) What is the halflife of the element? 
Engineering Math
An unknown radioactive element decays into nonradioactive substances. In 120 days the radioactivity of a sample decreases by 59 percent. What is the half life of the element? 
Science
An element has a halflife of 30 years. If 1.0 mg of this element decays over a period of 90 years, how many mg of this element would remain? 
math
An element has a halflife of 30 years. If 1.0 mg of this element decays over a period of 90 years, how many mg of this element would remain?