Problem: Which of the following molecules contains an atom with an expanded octet?a. XeF2b. GaCl3c. ONF3d. SeO2F2

FREE Expert Solution

We’re being asked to determine which of the molecules contains an atom with an expanded octet

Recall that the octet rule states that an element is surrounded by eight electrons in the Lewis structure. 

Exceptions to this rule occur when:

• there is an odd number of electrons, like in radicals

• there are less than 8 electrons or incomplete octet

• there are more than 8 electrons or expanded octet. This occurs to nonmetals from Period 3 to 7.

For this problem, we need to draw the Lewis structure for each compound. 

To do so, we need the following steps:

Step 1: Determine the central atom in this molecule.

Step 2: Calculate the total number of valence electrons present.

Step 3: Draw the Lewis structure for the molecule.

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Problem Details

Which of the following molecules contains an atom with an expanded octet?

a. XeF2

b. GaCl3

c. ONF3

d. SeO2F2

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What scientific concept do you need to know in order to solve this problem?

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