[Solved] "Naked eye astronomers" know that, if you want to view a dim star without a telescope you should A) stare at it intently for several seconds. B) close your left eye, then move your head slowly back and forth. C) make sure that you are surrounded by bright lights. D) not look directly at it. E) avoid consuming foods that are rich in vitamin A. Element: A pure chemical substance consisting of one type of atom, distinguished by its atomic number. Zinc-65: A radioactive isotope of zinc with a half-life of 244 days, often used as a tracer in studies of zinc metabolism. Protons: Positively charged subatomic particles found in the nucleus of an atom, contributing to the atom's mass and defining the element. Zinc: A chemical element with the symbol Zn and atomic number 30; it is a slightly brittle metal at room temperature and has a variety of uses, from galvanization to dietary supplements.