Question

1. classify the following as either a metal, metalloid or a nonmetal:
2. si
3. na
4. al

Explanation:

• Si (Silicon): In the periodic table, elements along the "stair - step" line (B, Si, Ge, As, Sb, Te, Po) are metalloids. Silicon is located along this line.
• Na (Sodium): Metals are found on the left - hand side and in the middle of the periodic table. Sodium is in Group 1 (alkali metals), which are all metals.
• Al (Aluminum): Aluminum is in Group 13. Although it is close to the metalloid line, it has typical metallic properties such as high thermal and electrical conductivity, malleability, and ductility.

Answer:

1. Metalloid
2. Metal
3. Metal