Correct increasing order of first ionisation | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) As we move across the period,nuclear charge increases and atomic size decreases,hence ionisation enthalpy generally increases.For $Al$ $([Ne] 3s^2

Vedclass · Accepted Answer

$Na  Al < Si$

Vedclass · Answer

(A) As we move across the period,nuclear charge increases and atomic size decreases,hence ionisation enthalpy generally increases.For $Al$ $([Ne] 3s^2 3p^1)$,the electron is removed from a partially filled $3p$ orbital,whereas for $Mg$ $([Ne] 3s^2)$,the electron is removed from a stable,fully filled $3s$ orbital.Removal of an electron from a stable,fully filled orbital requires more energy than removal from a partially filled orbital.Therefore,the ionisation enthalpy of $Mg$ is greater than that of $Al$.The correct order of first ionisation enthalpies is: $Na  Al < Si$.

Correct increasing order of first ionisation potential is

Similar Questions

The incorrect statement is:

The first ionization potentials in electron volts $(eV)$ of nitrogen and oxygen atoms are respectively given by:

Assertion : First ionization energy for nitrogen is lower than oxygen.
Reason : Across a period effective nuclear charge decreases.

Mercury is the only metal which is liquid at $0 \, ^oC$. This is due to its:

Which of the following orders is correct for the property mentioned in brackets?

Vedclass Test Series

Exam Paper Generator

Online Exam Module