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Course: Class 11 Chemistry (India) > Unit 3

Lesson 4: Periodic trend in chemical properties of elements

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Valence electrons and ionic compounds

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You might need: Periodic table

The first four ionization energies for element X are shown below.

‍	Ionization energy ( $kJ / mol$ ‍)
First	$738$ ‍
Second	$1451$ ‍
Third	$7733$ ‍
Fourth	$10543$ ‍

Based on the information in the table, which of the following is the most likely empirical formula of the ionic compound that forms between element X and oxygen?

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Valence electrons and ionic compounds

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Worked example: Finding the formula of an ionic compound