The successive ionisation enthalpies (kJ mol -1 ) of an element are 738, 1451, 7733 and 10540. The element most likely belongs to:

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The successive ionisation enthalpies (kJ mol<sup>-1</sup>) of an element are 738, 1451, 7733 and 10540. The element most likely belongs to:

Answer: Group 2.

A Group 1
B Group 13
C Group 2
D Group 14

Correct answer: C. Group 2

Explanation: The large jump after the 2nd ionisation shows only two easily removed electrons, indicating two valence electrons, i.e. a Group 2 element (magnesium).

The complete modern periodic table showing all 118 elements with atomic number, symbol, and atomic mass, color-coded by element category

The complete modern periodic table (118 elements). Image: Cepheus et al., Public Domain, via Wikimedia Commons.

Concept context

The periodic table organises all 118 elements by atomic number and similar properties. Study periodic trends like atomic radius, ionization energy, and electronegativity, and learn how an element's position predicts its behaviour.

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The successive ionisation enthalpies (kJ mol<sup>-1</sup>) of an element are 738, 1451, 7733 and 10540. The element most likely belongs to:

Concept context

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