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They have the same number of 'free electrons' in their outer ring. They both have 7 free outer electrons, this means that all group 7 elements have 7 free outer electrons.

because increasing the temperature will increase the kinetic energy of molecules, hence there is more collisions between the molecules and more molecules having the IE above the activation energy

Copper has a [Ar]4s1 4d10 whereas Chromium has a [Ar]4s14d5 electron configuration as this d shell configuration of either half full d shell (5 electrons) with only one electron per orbital or fully full ...

• Forward and backward reactions occur at equal rates
• Concentration of reactants and products remains constant

Enthalpy change refers to the change in heat pressure given out or taken in by a system when the pressure is constant.