Cual es el simbolo quimico que tiene 55 protones ?

How many liters of hydrogen gas will be produced at stp from the reaction of 7.179×10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

How many neutrons does an element have if its atomic number is 50 and its mass number is 166