An ionic isotope has 49 protons, 50 electrons, and 55 neutrons. • What is the name of the element?
What is the isotope symbol in the one-line format (e. g., hydrogen-2)?
Is this a cation or is this an anion? Explain how you know.

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

Which element is least likely to undergo a chemical reaction