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Question

The (IE1) and the (IE2) in kJ mol1 of a few elements designated by Roman numerals are shown below:
IIIIE1400589IE225101120
Elements I and II respectively are likely to be?

A
Non-metal, alkali metal
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B
Alkali metal, alkaline earth metal
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C
Alkaline earth metal, non metal
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D
Alkaline earth metal, alkali metal
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Solution

The correct option is B Alkali metal, alkaline earth metal
For I, the second ionization energy is 6 times that of the first ionization energy. This huge jump indicates that the atom attains a stable electronic configuration after the removal of the first electron. Hence, it must br an alkali metal.

For II, the first ionization energy is lower than the second ionization energy and there is no significant jump. So, it must be an alkaline earth metal.

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