Questions: The element with an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8 is in group and period . The element with an electron configuration of 1s^2 2s^2 2p^6 is in group and period .

The element with an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8 is in group and period .
The element with an electron configuration of 1s^2 2s^2 2p^6 is in group and period .

Transcript text: The element with are electron configuration of $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{8}$ is in group $\square$ and period $\square$. The element with an electron configuration of $1 s^{2} 2 s^{2} 2 p^{6}$ is in group $\square$ and period $\square$.

Solution

Solution Steps

Step 1: Determine the group and period for the first element

The electron configuration given is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8$.

Identify the total number of electrons: $2 + 2 + 6 + 2 + 6 + 2 + 8 = 28$.
The element with 28 electrons is Nickel (Ni).
Nickel is in the 3d block, which corresponds to the transition metals.
The group number for transition metals is determined by the sum of the electrons in the outermost s and d orbitals: $2 (4s) + 8 (3d) = 10$. However, for transition metals, the group number is typically given as 10.
The period number is determined by the highest principal quantum number (n) in the electron configuration, which is 4.

Thus, the element is in group 10 and period 4.

Step 2: Determine the group and period for the second element

The electron configuration given is $1s^2 2s^2 2p^6$.

Identify the total number of electrons: $2 + 2 + 6 = 10$.
The element with 10 electrons is Neon (Ne).
Neon is a noble gas.
Noble gases are in group 18.
The period number is determined by the highest principal quantum number (n) in the electron configuration, which is 2.

Thus, the element is in group 18 and period 2.

Final Answer

The element with the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8$ is in group $\boxed{10}$ and period $\boxed{4}$.
The element with the electron configuration $1s^2 2s^2 2p^6$ is in group $\boxed{18}$ and period $\boxed{2}$.

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