The answer is A, an isolated gaseous aluminium atom.

Here's the step-by-step explanation:

1. The number of unpaired electrons in an atom is determined by its electron configuration in the ground state.

2. The electron configuration of an aluminium atom is [Ne] 3s2 3p1. This means that there are two electrons in the 3s orbital and one electron in the 3p orbital.

3. The 3s orbital can hold a maximum of two electrons, so it is completely filled. However, the 3p orbital can hold a maximum of six electrons, so it has five empty spaces.

4. Therefore, an aluminium atom has three unpaired electrons in its ground state: two in the 3s orbital and one in the 3p orbital.

5. The other options (carbon, chromium, and phosphorus) do not have exactly three unpaired electrons in their ground states.

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The answer is A, an isolated gaseous aluminium atom.

Here's the step-by-step explanation:

1. The number of unpaired electrons in an atom is determined by its electron configuration in the ground state.

2. The electron configuration of an aluminium atom is [Ne] 3s2 3p1. This means that there are two electrons in the 3s orbital and one electron in the 3p orbital.

3. The 3s orbital can hold a maximum of two electrons, so it is completely filled. However, the 3p orbital can hold a maximum of six electrons, so it has five empty spaces.

4. Therefore, an aluminium atom has three unpaired electrons in its ground state: two in the 3s orbital and one in the 3p orbital.

5. The other options (carbon, chromium, and phosphorus) do not have exactly three unpaired electrons in their ground states.

Knowee AI · Accepted Answer

The answer is A, an isolated gaseous aluminium atom.

Here's the step-by-step explanation:

1. The number of unpaired electrons in an atom is determined by its electron configuration in the ground state.

2. The electron configuration of an aluminium atom is [Ne] 3s2 3p1. This means that there are two electrons in the 3s orbital and one electron in the 3p orbital.

3. The 3s orbital can hold a maximum of two electrons, so it is completely filled. However, the 3p orbital can hold a maximum of six electrons, so it has five empty spaces.

4. Therefore, an aluminium atom has three unpaired electrons in its ground state: two in the 3s orbital and one in the 3p orbital.

5. The other options (carbon, chromium, and phosphorus) do not have exactly three unpaired electrons in their ground states.

1 Which atom has exactly three unpaired electrons in the ground state?A an isolated gaseous aluminium atomB an isolated gaseous carbon atomC an isolated gaseous chromium atomD an isolated gaseous phosphorus atom

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