Question

question 4. drag the appropriate terms or numbers into the correct spaces in the table below:

ion type | number of electrons | electron configuration of ion | noble gas configuration achieved
--- | --- | --- | ---
na⁺ | | |
n³⁻ | | |
ca²⁺ | | |
br⁻ | | |
al³⁺ | | |

various numbers and electron configurations as options below the table

Explanation:

Step1: Analyze $\ce{Na+}$

Sodium (Na) has an atomic number of 11, so a neutral Na atom has 11 electrons. $\ce{Na+}$ is formed by losing 1 electron, so the number of electrons is $11 - 1 = 10$. The electron configuration of $\ce{Na+}$ is $1s^2 2s^2 2p^6$ (since it loses the 3s¹ electron), and this matches the noble gas configuration of neon (Ne).

Step2: Analyze $\ce{N^{3-}}$

Nitrogen (N) has an atomic number of 7, so a neutral N atom has 7 electrons. $\ce{N^{3-}}$ is formed by gaining 3 electrons, so the number of electrons is $7 + 3 = 10$. The electron configuration is $1s^2 2s^2 2p^6$, which is the noble gas configuration of neon (Ne).

Step3: Analyze $\ce{Ca^{2+}}$

Calcium (Ca) has an atomic number of 20, so a neutral Ca atom has 20 electrons. $\ce{Ca^{2+}}$ is formed by losing 2 electrons, so the number of electrons is $20 - 2 = 18$. The electron configuration is $1s^2 2s^2 2p^6 3s^2 3p^6$ (losing the 4s² electrons), which is the noble gas configuration of argon (Ar).

Step4: Analyze $\ce{Br-}$

Bromine (Br) has an atomic number of 35, so a neutral Br atom has 35 electrons. $\ce{Br-}$ is formed by gaining 1 electron, so the number of electrons is $35 + 1 = 36$. The electron configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6$, which is the noble gas configuration of krypton (Kr).

Step5: Analyze $\ce{Al^{3+}}$

Aluminum (Al) has an atomic number of 13, so a neutral Al atom has 13 electrons. $\ce{Al^{3+}}$ is formed by losing 3 electrons, so the number of electrons is $13 - 3 = 10$. The electron configuration is $1s^2 2s^2 2p^6$, which is the noble gas configuration of neon (Ne).

Filling the Table:

Ion Type	Number of Electrons	Electron Configuration of Ion	Noble Gas Configuration Achieved
$\ce{N^{3-}}$	10	$1s^2 2s^2 2p^6$	neon (Ne)
$\ce{Ca^{2+}}$	18	$1s^2 2s^2 2p^6 3s^2 3p^6$	argon (Ar)
$\ce{Br-}$	36	$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6$	krypton (Kr)
$\ce{Al^{3+}}$	10	$1s^2 2s^2 2p^6$	neon (Ne)

Answer:

The table is filled as shown above with the respective number of electrons, electron configurations, and noble gas configurations for each ion.