Lesson: Chapter 10 — Chemical Bonds

10.2. Covalent bonds 7 of 12 Reset answers

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Question 7

An oxygen atom is 2, 6 and forms two bonds in a water molecule. How many lone pairs does that oxygen atom keep?

A One B Three C Four D Two

The right answer is the one marked above.

Two. Oxygen brings six valence electrons. Two of them go into the two bonding pairs, leaving four — that is, two lone pairs.

Four is the number of electrons left over, not the number of pairs. One and three do not divide the remaining four electrons into pairs at all.

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