The nucleus of an atom is 531271 contains (1) 53 neutrons and 127 protons
(3) 53 protons and 74 neutrons
(2) 53 protons and 127 neutrons
(4) 53 protons and 74 electrons

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

How are elements arranged in a periodic table

In which reaction is precipitation occurring?