Can anyone answer this asap i need it quick

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?