Which of the following elements has the lowest ionisation enthalpy? (a) H □(b) Cl (c) He □(d) Fr

Name: Problem 57, Chapter 1: Inorganic Chemistry for Jee mains and Advanced
Uploaded: 2021-08-22T13:53:48-08:00
Duration: 1 min 24 s
Channel: Alkendra Singh
Description: Which of the following elements has the lowest ionisation enthalpy? (a) H □(b) Cl (c) He □(d) Fr

step 1 Hello, question is which of the following has the lowest IORNitization enthalpy? Okay, so we are

Which of the following elements has the lowest ionisation...

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Key Concepts

Ionisation Enthalpy

Ionisation enthalpy is the energy required to remove an electron from an atom or ion in its gaseous state. It is a fundamental property that influences an element’s chemical reactivity and behavior in various chemical processes.

Periodic Trends

Periodic trends refer to predictable changes in element properties as one moves across periods and down groups in the periodic table. With regards to ionisation enthalpy, it typically increases across a period due to increasing effective nuclear charge and decreases down a group because of the increased electron shielding and larger atomic radii.

Electron Shielding

Electron shielding occurs when inner-shell electrons partially block the attractive force of the nucleus on the outer-shell electrons. This results in a lower effective nuclear charge experienced by the valence electrons, thereby reducing the ionisation enthalpy.

Atomic Radius

Atomic radius is the measure of the size of an atom, generally defined as the distance from the center of the nucleus to the outer boundary of the electron cloud. A larger atomic radius, which usually occurs down a group, is associated with lower ionisation enthalpy as the outer electrons are less strongly attracted to the nucleus.

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