4. Un elemento consta de dos siótopos. La abundancia de un isotopo es de 95,72% y
su masa atómica 114,9041 uma, la masa
atómica del segundo isotopo es 112,9043
uma. ¿Cuál es la masa atómica promedio
del elemento?​

Which of the following methods uses the decay of atomic particles in an object to find its exact age? a. fossil dating b. geologic dating c. radioactive dating d. relative dating

Compare and contrast physical changes with chemical changes.

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.