Which of the following is an inner transition metal that scientist believe is involved in the heating of Earth's interior?

neodymium
uranium
samarium
einsteinium

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

What reaction is taking place? 02 + c3h8 = h20 + co2