Which Of The Following Elements Will Have The Lowest First Ionisation Energy?

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Question

Which of the following elements will have the lowest first ionisation energy?

Li
Mg
Ca
Rb

easy

Solution

Correct option is

Rb

IE decreases in a group and increases in a period. Thus, Rb has the lowest IE.

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SIMILAR QUESTIONS

Q1

If Aufbau rule is not followed, K-19 will be placed in

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Q2

Which of the following has largest size?

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Q3

Which of the following has largest ionic radius?

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Q4

Which of the following ion is the smallest ion?

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Q5

Which of the following is the smallest in size?

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Q6

The smallest among the following ions is

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Q7

In the isoelectronic species the ionic radii (Å) of N^3–, O^2– and F^– are respectively given by

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Q8

The trivalent ion having largest size in lanthanide series is

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Q9

A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration

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Q10

The correct order of ionisation energy for comparing carbon, nitrogen and oxygen is

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