silicon
argon
magnesium
the alkaline earth metal in period 3
the noble gas in period 3
the metalloid in period 3
electron configuration
name of element

Question

Accepted Answer

# Explanation:
## Step1: Determine the alkaline - earth metal in period 3
Alkaline - earth metals have 2 valence electrons. In period 3, the element with electron configuration $1s^{2}2s^{2}2p^{6}3s^{2}$ is magnesium ($Mg$).
## Step2: Determine the metalloid in period 3
Metalloids have intermediate properties. The electron configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}$ corresponds to silicon ($Si$).
## Step3: Determine the noble gas in period 3
Noble gases have full - filled valence shells. The electron configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ is for argon ($Ar$).

# Answer:
| Electron Configuration | Name of Element |
|--|--|
| $1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}$ | Silicon |
| $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ | Argon |
| $1s^{2}2s^{2}2p^{6}3s^{2}$ | Magnesium |

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QUESTION IMAGE

Question

Explanation:

Step1: Determine the alkaline - earth metal in period 3

Step2: Determine the metalloid in period 3

Step3: Determine the noble gas in period 3

Answer:

Electron Configuration	Name of Element
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\)	Argon
\(1s^{2}2s^{2}2p^{6}3s^{2}\)	Magnesium