Staar Metals Nonmetals and Metalloids

A student is trying to classify an unidentified, solid gray materials as a metal or a nonmetal. Which questions will best help the student classify the material?

• Is the material malleable or ductile?

• Does the material feel hard to the touch?

• Will the material float in water?

• Does the material feel rough or smooth?

Which statement does NOT correctly compare silicon with another element?

• Silicon is a better conductor of electricity than sulfur

• Silicon conducts electricity as well as copper does

• Silicon is a solid at room temperature, but argon is a gas

• Silicon is less malleable than silver

Aluminum, sulfur, and chlorine are elements found on the periodic table. Test involving these three elements would show that at a normal room temperature--

• sulfur is malleable and aluminum conducts electricity

• chlorine is malleable and conducts electricity

• aluminum is malleable and conducts electricity

• all three elements are malleable and conduct electricity

Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table.

Based on these observations, which sample is most likely a nonmetal?

• Sample 1

• Sample 2

• Sample 3

• Sample 4

Which element is a nonmetal?

• 1

• 2

• 3

Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, nonmetal or a metalloid.

Which table was completed correctly?

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Tags

NGSS.MS-PS1-1

Which pair of properties describes the elements in Group 18?

• they are chemically stable and liquid at room temperature

• they have eight valence electrons and are flammable

• they are magnetic and boil at low temperatures

• they are gaseous at room temperature and chemically stable

The model of the periodic table below shows the locations of four elements.

A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location in this periodic table would the element most likely be found?

• 1

• 2

• 3

• 4

Which of these is a property of metals?

• It's malleable
• It can't conduct electricity
• They are used in food
• It's very brittle

Which of the following is a good conductor of heat?

• Metal
• Nonmetal
• Metalloid