Question

guided practice: classify the elements
for each element below, review its properties. then, identify its category (metal, metalloid, or nonmetal) and use the substance’s form at room temp to explain your reasoning.
element 1: iron
properties:

• high luster (shiny)
• malleable & ductile
• good conductor
• solid at room temp

category:
image of iron
element 2: sulfur
properties:

• pale yellow solid
• brittle (breaks easily)
• poor conductor
• low melting point

category:
element 3: silicon
properties:

• has metallic luster
• brittle
• semi - conductor
• solid at room temp

category:
element 4: copper
properties:

• reddish - brown, lustrous
• excellent conductor
• malleable & ductile
• solid at room temp

category:
element 5: oxygen
properties:

• colorless gas
• poor conductor
• not malleable/ductile
• gas at room temp

category:
element 6: boron
properties:

• mostly dull, can be shiny
• brittle solid
• poor conductor at room temp
• semi - conductor at high temps

category:
self - check answers

1. iron: metal | 2. sulfur: nonmetal | 3. silicon: metalloid | 4. copper: metal | 5. oxygen: nonmetal | 6. boron: metalloid

Explanation:

Step1: Analyze Iron's Properties

Iron has high luster, is malleable/ductile, a good conductor, and is solid at room temp. These match metal properties.

Step2: Analyze Sulfur's Properties

Sulfur has dull luster, is brittle, poor conductor, low melting point. These match nonmetal properties.

Step3: Analyze Silicon's Properties

Silicon has metallic luster but is brittle, semi - conductor. These match metalloid properties.

Step4: Analyze Copper's Properties

Copper is lustrous, excellent conductor, malleable/ductile, solid at room temp. These match metal properties.

Step5: Analyze Oxygen's Properties

Oxygen is a gas, poor conductor, not malleable/ductile. These match nonmetal properties.

Step6: Analyze Boron's Properties

Boron is dull (can be shiny), brittle, poor conductor (semi - conductor at high temp). These match metalloid properties.

Answer:

Element 1 (Iron): Metal
Element 2 (Sulfur): Nonmetal
Element 3 (Silicon): Metalloid
Element 4 (Copper): Metal
Element 5 (Oxygen): Nonmetal
Element 6 (Boron): Metalloid