Question : Which of the following pairs of "elements - valency" is correct?
I. Boron - 2
II. Fluorine - 3
Option 1: Neither I nor II
Option 2: Both I and II
Option 3: Only II
Option 4: Only I
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Correct Answer: Neither I nor II
Solution : The correct answer is Neither I nor II .
Although it might seem like Boron could have a valency of 2 because it has three valence electrons, it tends to form compounds by sharing those 3 electrons, achieving a stable octet for each atom. Therefore, its valency is 3, not 2. Fluorine has only seven electrons and needs just one more electron to achieve a stable octet. Thus, its valency is 1, not 3.
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