What is ( n + 1 ) rule?​

Find the protons, electrons and neutrons for strontium with a mass of 83

The clouds are grey and ground is wet. a quantitative b qualitative

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.