The half-life of a certain radioactive element is 1250 years. what percent of the atom remains after 7500 years?

The atomic mass of oxygen is 16 and the atomic mass of hydrogen is 1. How do the current atomic masses of oxygen and hydrogen compare to Dalton's?

Select all that apply. The electron configurations of some elements are given. Based on the electron configurations which elements can likely form ions with multiple charges? A. Zinc [Ar] 3d^10 4s^2 B. Iron [Ar] 3d^6 4s^2 C. Sodium [Ne] 3s^1 D.

Which is the best way to represent 0.0035 kg by using scientific notation?

Is the change in color of tree leaves in the fall an example of a physical change

How does the Coriolis effect benefit people who travel by airplane? Answer Options with 4 options A. When planes travel with prevailing winds, people save fuel and decrease travel time. B.

In the teapot dome scandal, what did the secretary of the interior albert fall lease

A Material made of equal parts is called what? A. Atom, B. Pure substance, C. Mixture

Part C Why are dichotomous keys useful in classifying a new species?

2. How is the frequency of a wave determined?

Ammonium acetate chemical formula