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Answer :
Final answer:
The third period elements in the periodic table include Sodium (Na), Magnesium (Mg), Aluminum (Al), Silicon (Si), Phosphorus (P), Sulfur (S), Chlorine (Cl), Argon (Ar). These are further classified into metals (Na, Mg, Al), non-metals (P, S, Cl, Ar), and metalloids (Si).
Explanation:
The third period elements of the periodic table are defined by elements that have their outer electrons in the third energy level or 3rd shell. These elements include:
- Sodium (Na)
- Magnesium (Mg)
- Aluminum (Al)
- Silicon (Si)
- Phosphorus (P)
- Sulfur (S)
- Chlorine (Cl)
- Argon (Ar)
Classifying them, we have:
Metals:
Sodium (Na), Magnesium (Mg),Aluminum (Al)
Non-Metals:
Phosphorus (P), Sulfur (S), Chlorine (Cl), Argon (Ar)
Metalloids:
Silicon (Si)
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