Answers CR Physical Science Sem. 1Atomic Theory

Metalloids Answers

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Which statement describes a property that is unique to metalloids?

Metalloids are shiny.

Metalloids are semiconductive.

Metalloids are solid.

Metalloids are brittle.

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Which element in period 3 on the periodic table is a metalloid?

magnesium (Mg)

aluminum (Al)

silicon (Si)

sulfur (S)

The table shows columns that Brenda uses for her notes on the properties of elements. Her notes state that some elements can react to form basic compounds.Where should Brenda place this property in her table?

only in the column for metalloids

only in the column for nonmetals

in the columns for metalloids and for nonmetals

in the columns for metals and for metalloids

Which lists the elements in order from least conductive to most conductive?

nitrogen (N), antimony (Sb), bismuth (Bi)

nitrogen (N), bismuth (Bi), antimony (Sb)

antimony (Sb), nitrogen (N), bismuth (Bi)

bismuth (Bi), antimony (Sb), nitrogen (N)

Solar panels convert light energy from sunlight into electrical energy. What material is most likely used in solar panels, and why?

A nonmetal is used because it is a semiconductor and can become more conductive when more light shines on it.

A metalloid is used because it is a good conductor but can become less conductive when more light shines on it.

A metalloid is used because it is a semiconductor and can become more conductive when more light shines on it.

A nonmetal is used because it is a poor conductor but can become more conductive when more light shines on it.

Which metalloid has three valence electrons?

boron

arsenic

silicon

lithium

The table shows columns that Franklin uses to organize his notes on the properties of elements. His notes state that some elements are widely used in semiconductors.Where should Franklin place this property in his table?

only in the column for metalloids

only in the column for nonmetals

in the columns for metalloids and for nonmetals

in the columns for metals and for metalloids

Which element is a metalloid?

selenium (Se)

germanium (Ge)

phosphorus (P)

iodine (I)

How does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors?

They have one or two valence electrons, so they cannot lose electrons easily.

They have one or two valence electrons, so they can lose or gain electrons.

They have three to six valence electrons, so they cannot lose electrons easily.

They have three to six valence electrons, so they can lose or gain electrons.

For metalloids on the periodic table, how do the group number and the period number relate?

The lower the group number, the lower the period numbers, so the metalloids are found in a diagonal moving down from left to right.

The lower the group number, the higher the period numbers, so the metalloids are found in a diagonal moving up from left to right.

The higher the group number, the lower the period numbers, so the metalloids are found in a diagonal moving down from left to right.

The higher the group number, the higher the period numbers, so the metalloids are found in a diagonal moving up from left to right.

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Metalloids Answers

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