Answer:
positive ion is a Cation while a negative ion is called an anion
Sr will always have 38 protons because that is its atomic number. Normally Sr has 38 protons and 49 neutrons yielding an atomic mass of 87. unless you are dealing with an isotope of Strontium in which 3 additional neutrons would give you the 53 neutrons in your answer, (38p, 52n).
What? It would be nice if you show pic
From shortest wavelength to longest wavelength: ultraviolet ,visible light ,infrared
