Question

The element having least difference in the values of first and second ionization potential is
a. Na
b. K
c. Li
d. Mg
(Give reason also)

Answer 1

Answer:Mg

Explanation:in case of Mg after removing 2 electrons only inert gas configuration is attained but sodium and potassium gets it after removing only one electron

So in case of Na and k second I. E isomer so high and first I. E isomer very less but the difference in the 2 values is very high, lithium after removing one electron gets helium configuration, so the difference is less in case of Magnesium

Answer 2

The element having least difference in the values of first and second ionization potential is magnesium (Mg).

Option: (d)

Explanation:  

• Sodium, Potassium, and Lithium are alkali metal. So this metal are just one electron more than the inert gas configuration.  

• The inert gas configuration is very stable so a large amount of ionization energy is required to remove the second electron from these elements.  

• But in the case of magnesium it has two electrons more than the inert gas configuration.

• Hence very less amount of energy is required to remove the electron from the unipositive ion.  

• So the difference between the first and the second ionization potential is very less in case of magnesium.

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