well, the area of the periodic table it's on will tell you if it's a metal.
ion is an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons.
isotope is one of two or more atoms having the same atomic number but different mass numbers.
when an atom loses electrons to another atom, or gains electrons, it becoms and ion.
and isotope is where you have to atoms that have the same atomic number have a different mass.
and also, Xenon is a colorless, odorless, highly unreactive gaseous element found in minute quantities in the atmosphere, extracted commercially from liquefied air and used in stroboscopic, bactericidal, and laser-pumping lamps. Atomic number 54; atomic weight 131.29; melting point -111.9°C; boiling point -107.1°C; density (gas) 5.887 grams per liter; specific gravity (liquid) 3.52 (-109°C).