Question

independent practice: classifying elements
directions: read the properties for each unknown element. classify it as a metal, metalloid, or nonmetal by writing your answer on the line. you can also color - code the box using the key. then, rate your confidence from 1 (not sure) to 5 (very sure).
color key
metal
nonmetal
metalloid
element 1

• property 1 (partially visible)
• property 2 (partially visible)
• good conductor of electricity

classification:
confidence (1 - 5):
element 2

• property 1 (partially visible)
• property 2 (partially visible)
• poor conductor (insulator)

classification:
confidence (1 - 5):
element 3

• solid at room temp
• brittle (can be shiny)
• semi - conductor of electricity

classification:
confidence (1 - 5):
element 4

• solid at room temp; malleable
• shiny - white color
• excellent conductor of heat

classification:
confidence (1 - 5):
element 5

• found on the right side of the periodic table; brittle solid

classification:
confidence (1 - 5):
element 6

• has properties of both metals and nonmetals

classification:
confidence (1 - 5):
element 7

• found along the stair - step line of the periodic table

classification:
confidence (1 - 5):
element 8

• high luster and density
• found on the left side of the periodic table

classification:
confidence (1 - 5):
element 9

• liquid at room temperature
• does not conduct electricity
• located in group 17

classification:
confidence (1 - 5):
element 10

• soft, silvery - white solid
• reacts vigorously with water
• found in group 1

classification:
confidence (1 - 5):
my reasoning & reflection
which element was most difficult to classify, and why? which element classification were you most confident about, and why?

Explanation:

Element 1:

Step1: Identify properties

Properties: Shiny luster, malleable, good conductor of electricity.

Step2: Classify

These are typical metal properties. So classification: Metal. Confidence: 5 (since properties match metals well).

Element 2:

Step1: Identify properties

Properties: Dull appearance, poor conductor (insulator).

Step2: Classify

These are non - metal properties. Classification: Nonmetal. Confidence: 5.

Element 3:

Step1: Identify properties

Properties: Solid at room temp, brittle, semi - conductor of electricity.

Step2: Classify

Semi - conductors and brittle solids with these properties are metalloids. Classification: Metalloid. Confidence: 4.

Element 4:

Step1: Identify properties

Properties: Solid at room temp (metal), silvery - white color, excellent conductor of heat.

Step2: Classify

These are metal properties. Classification: Metal. Confidence: 5.

Element 5:

Step1: Identify properties

Properties: Found on the right side of the periodic table, brittle solid.

Step2: Classify

Right - side, brittle solids are non - metals. Classification: Nonmetal. Confidence: 4.

Element 6:

Step1: Identify properties

Properties: Has properties of both metals and nonmetals.

Step2: Classify

This is the definition of a metalloid. Classification: Metalloid. Confidence: 5.

Element 7:

Step1: Identify properties

Properties: Found along the stair - step line of the periodic table.

Step2: Classify

Elements along the stair - step line are metalloids. Classification: Metalloid. Confidence: 5.

Element 8:

Step1: Identify properties

Properties: High luster and density, found on the left side of the periodic table.

Step2: Classify

Left - side, high luster and density are metal properties. Classification: Metal. Confidence: 5.

Element 9:

Step1: Identify properties

Properties: Liquid at room temperature, does not conduct electricity, located in Group 17.

Step2: Classify

Group 17 elements (halogens) that are liquid (like bromine) and non - conductors are nonmetals. Classification: Nonmetal. Confidence: 4.

Element 10:

Step1: Identify properties

Properties: Soft, silvery - white solid, reacts vigorously with water, found in Group 1.

Step2: Classify

Group 1 elements (alkali metals) have these properties. Classification: Metal. Confidence: 5.

Answer:

Element 1: Classification - Metal, Confidence - 5
Element 2: Classification - Nonmetal, Confidence - 5
Element 3: Classification - Metalloid, Confidence - 4
Element 4: Classification - Metal, Confidence - 5
Element 5: Classification - Nonmetal, Confidence - 4
Element 6: Classification - Metalloid, Confidence - 5
Element 7: Classification - Metalloid, Confidence - 5
Element 8: Classification - Metal, Confidence - 5
Element 9: Classification - Nonmetal, Confidence - 4
Element 10: Classification - Metal, Confidence - 5