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Metalloids — Unit test Answers

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Which is the property of nonmetals to evaporate easily?

brittle

dense

liquid

volatile

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Rutherford used positively charged particles to investigate the structure of the atom. The results surprised him, and he developed the atomic model shown below.

A few positive particles bounced back because they bounced off of the net formed by the ovals.

A few positive particles bounced back because they were pushed away from the positive center.

Most positive particles passed through because of the empty space between the outer edge and the center.

Most positive particles passed through because they were attracted by the small particles moving around the center.

Who was the first chemist to organize elements by atomic number?

Johann Wolfgang Döbereiner

Antoine Lavoisier

Henry Moseley

John Newlands

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.

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

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

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

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 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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Metalloids — Unit test Answers

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