Arsenic

Which important change in electronic devices, such as televisions and computers, is a result of the use of metalloids as semiconductors?

• Electronic devices have become smaller.

• Electronic devices are now more brittle.

• Electronic devices now use more energy.

• Electronic devices have become more expensive.

Atoms of arsenic (As) are often added to silicon (Si) in a process called doping to change the conductivity of the silicon. How does the addition of arsenic change the conductivity of silicon?

• An atom of arsenic has one fewer valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom gains an electron.

• An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom loses the electron.

• An atom of arsenic has one fewer valence electron and fewer electron shells than an atom of silicon, so the conductivity increases because the arsenic atom gains an electron.

• An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity increases because the arsenic atom loses the electron.

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Period 4, Group 15

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What is the atomic number of arsenic?

• 32

• 33

• 34

• 35

Which group in the periodic table does arsenic belong to?

• Group 14

• Group 15

• Group 16

• Group 17

Arsenic is commonly used in which of the following applications?

• Food preservation

• Semiconductor doping

• Water purification

• Fertilizer production

What is the electron configuration of arsenic?

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Which of the following is a property of arsenic?

• It is a good conductor of electricity.

• It is a metalloid.

• It is a noble gas.

• It is a halogen.

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Arsenic is often found in nature combined with which element?

• Oxygen

• Hydrogen

• Sulfur

• Nitrogen

What is the most stable oxidation state of arsenic in compounds?

• +1

• +3

• +5

• +7

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