As the elements in Group 1 of the Periodic Table are considered in order of increasing acomic number, the atomic radius of each successive element increases. This is primarily
due to an increase in the number of
1) neutrons in the nucleus
3) valence electrons
2) unpeired electrons
4) electron shells
the said state each atom ofan element has two valence electrons. This element

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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.