What method is suitable to determine whether barium is more reactive than calcium

by looking at the number of electrons in the outermost shell of an atom determines its reactivity (the number on top of the column)

Explanation:

calcium and barium are both in column 2, since barium is located further in the column, it's more reactive

plus barium also have a larger mass than calcium

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.