Which of the following is/are true? a The atomic radius of hydrogen is 37 pm
b. The atomic radius of chlorine is 99 pm
C The atomic radius of bromine is 114 pm
d All of the above

A is true.

B is true.

C is true.

So all of the above. D.

Hope this helps!

a:

by the combination of an unlimited number of elements

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.