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Metalloids — Unit test Answers

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Which metal is most likely to form more than one kind of positively charged ion?

sodium (Na)

barium (Ba)

nickel (Ni)

magnesium (Mg)

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Students are completing a table about a particular subatomic particle that helps make up an atom.What best explains how they should complete the table?

with “Inside the nucleus,” because the particle is a proton

with “Inside the nucleus,” because the particle is a neutron

with “Outside the nucleus,” because the particle is a proton

with “Outside the nucleus,” because the particle is an electron

Which element is most likely to carry electric current easily?

tin (Sn)

sulfur (S)

antimony (Sb)

selenium (Se)

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

The atom has 7 neutrons and 8 protons.

The atom has 7 electrons and 8 protons.

The atom has 8 neutrons and 7 electrons.

The atom has 8 electrons and 7 protons.

Which is the property of nonmetals to evaporate easily?

brittle

dense

liquid

volatile

Where are alkaline earth metals found on the periodic table?

Group 1

Group 2

Groups 3–12

Group 17

This is how manganese appears in the periodic table.

period symbol of manganese

isotope symbol of manganese

group symbol of manganese

chemical symbol of manganese

These models show the electron structures of two different nonmetal elements.

Element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table.

Element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table.

Element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons.

Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

What is an atomic nucleus?

the outer part of an atom in which electrons move

the outer part of an atom in which neutrons move

the central part of an atom, composed of protons and neutrons

the central part of an atom, composed of protons and electrons

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.

Sonya is studying a nonmetal element. She learns that the element is like other elements in its group because it can bond to form a salt or an acid. She also learns that the element is the most reactive element in its group. Which element is Sonya most likely studying?

sulfur (S)

neon (Ne)

fluorine (F)

iodine (I)

What best describes the states of nonmetals when they are at room temperature?

Most nonmetals are gaseous, but some are liquid or solid.

All nonmetals are gaseous unless they bond with a metal.

Most nonmetals are solids, but some are gaseous or liquid.

All nonmetals are solid unless they bond with a metal.

The model below shows an atom of an element.

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.

Which have different numbers of electrons?

different ions of an element

different isotopes of an element

the nucleus of an element

each of the atoms of an element

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Metalloids — Unit test Answers

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