An isotope of cesium (cesium-137) has a half-life of 30 years. If a 1.0 mg sample of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain

How does water evaporating from a glass show that matter is made up of particles? a. the heat energy from the air causes the glass to fill up with water particles. b. the liquid water particles turn into water vapor that spreads in the air. c. the particles of the glass dissolve in water and cause it to evaporate. d. the tiny particles of the glass evaporate and seem to disappear.