If we want to know how many neutrons an element has we: a. look at Period Number ( row)
b. subtract Atomic Number from Atomic Mass
c. look at Atomic Mass (below element symbol)
d. look at Atomic Number (above element symbol)

B

Explanation: I don’t really know how to explain this because it’s just something my teacher told me and it just stuck in my head

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.