Honors Chemistry Unit 3 Review

A horizontal row of the periodic table is called:

• A group

• An octet

• A period

• A family

Answer explanation

A horizontal row of the periodic table is called a period.

The vertical columns of elements in the periodic table are called:

• Triads

• Octaves

• Groups

• Periods

Answer explanation

The vertical columns in the periodic table are called groups. They represent elements with similar properties and valence electrons.

An example of a transition element is:

• Li

• As

• Be

• Ga

Answer explanation

A transition element is an element that has partially filled d orbitals in its ground state. Among the given choices, Ga is the only transition element as it has partially filled d orbitals in its ground state.

Tags

NGSS.HS-PS1-1

A negative ion is most likely to be formed by:

• Be

• Cl

• C

• Li

Answer explanation

A negative ion is formed when an atom gains electrons. Among the given choices, Cl is most likely to gain electrons and form a negative ion.

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For each successive electron removed from an atom, the ionization energy:

• Stays the same

• Depends on the element

• Increases

• Decreases

Answer explanation

The ionization energy increases for each successive electron removed from an atom.

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Which group of elements in the periodic table is located on both sides of the zigzag line?

• Alkali metals

• Transition metals

• Metalloids

• Noble gases

Answer explanation

Metalloids are the group of elements located on both sides of the zigzag line in the periodic table.

Tags

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The number of a column ("A" numbers specifically) on the periodic table indicates the number of:

• Valence electrons in each element of the column

• Elements in the column

• Occupied principal energy levels in the atoms of elements in that column

• Electrons in that column's last element

Answer explanation

The number of a column on the periodic table indicates the number of valence electrons in each element of the column.

Tags

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An atom of germanium is larger than an atom of silicon because the germanium atom has a greater nuclear charge.

• True

• False

Answer explanation

The statement is false. An atom of germanium is larger than an atom of silicon due to the presence of additional electron shells, not because of a greater nuclear charge (which would typically make it smaller).

Which of the following elements is least reactive?

• Na

• K

• Fe

• He

Answer explanation

The element He is the least reactive because it has a full outer electron shell, making it stable and less likely to react with other elements.

Tags

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Which of the following elements is a noble gas?

• Br

• Kr

• Li

• Na

Answer explanation

The correct choice is Kr, which is a noble gas.

Tags

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