The following table shows the currently accepted half-life values for six parent isotopes. parent isotope currently accepted half-life values uranium-238 4.5 billion years uranium-235 704 million years thorium-232 14.0 billion years rubidium-87 48.8 billion years potassium-40 1.25 billion years samarium-147 106 billion years earth is approximately 4.5 billion years old. given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope? potassium-40 rubidium-87 samarium-147 uranium-238

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Mitosis is a type of cell division that produces cells that are identical to the parent cell. meiosis is a different type of cell division that produces cells that carry have a genetic material of the parent cell. based on the information provided how do the purpose of mitosis and meiosis differ

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.