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Question

Which of the following elements do not lose an electron easily?

A
Na
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B
F
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C
Mg
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D
Cl
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Solution

The correct options are
B F
D Cl
Fluorine (F) and chlorine (Cl) have seven electrons in their outermost shell. These seven electrons are bound tightly by their nucleus. Also, as compared to sodium (Na) and magnesium (Mg), F and Cl have a tendency to gain an electron to achieve octet whereas Na and Mg being metals have tendency to lose electrons to gain octet. Hence, it is more difficult for F and Cl to lose an electron as compared to Na and Mg.

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