"The atom of an element has 15 electrons. How many energy levels are there in the atom, and how many of them are full of electrons?"

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Identify two types of chemical bonding in the source of dietary potassium

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.