SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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2-
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2+
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6-
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6+
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Detailed explanation-1: -Element X has 6 electrons in the outermost shell. In order to acquire noble gas configuration, element X requires 2 electrons. So, the charge on the anion (X2−) so formed is-2.
Detailed explanation-2: -Oxygen has 8 electrons—2 in the first shell, and 6 in the second shell (so six valence electrons). Fluorine has 9 electrons—2 in the first shell, and 7 in the second shell (so seven valence electrons). Neon has 10 electrons—2 in the first shell, and 8 in the second shell (so eight valence electrons).
Detailed explanation-3: -The oxygen family elements have 6 valence electrons. They gain two electrons and have a-2 charge.
Detailed explanation-4: -Therefore, it is very reactive and gives up electrons in chemical reactions. It is likely to react with an element with six valence electrons that “wants” to gain two electrons. This would be an element in group 6, such as oxygen.
Detailed explanation-5: -Those in group 2 (alkaline earth elements) usually have an ionic charge of +2.