Lithium( atomic number -3), Sodium( atomic number -11)and Potassium (atomic number -19) are in the same group in the periodic table with valence electron 1, but potassium seems to be more reactive than sodium and lithium. Why?

Potassium has an atomic radii that is greater than that of lithium that is why potassium is more reactive than lithium

Explanation:

This is because in lithium the valence electrons are closer to the nucleus therefore the attractive forces between nucleus and valence electrons are very strong.

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.

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