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Q. What is the general trend for first ionisation enthalpy in a group of the periodic table as we move from top to bottom?
Answer: it decreases
Notes: The first ionization enthalpy generally increases as we go across a period and decreases as we descend in a group. ionization enthalpy represents the energy required to remove an electron from an isolated gaseous atom (X) in its ground state.

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📌 Question Number: 27 in Chemistry-9-Periodic Table in the above course in App.