Name the following ionic substances
NaCl
CaO
MgBr2
Li2S
AlBr3

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.

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

0.66y = 0.9x + 0.48 if y has a value of 108.45 what is the value of x?