Final Exam Review 2024

Elements d-block elements can have more than one possible oxidation number.

• True
• False

In a crystal lattice, how are the ions arranged?

• Positive ions are surrounded by negative ions

• Negative ions are surrounded by positive ions

• Both of the above

• None of the above

A single unit of a covalent compound is called a(n)

• formula unit

• atoms

• molecule

A single unit of an element is called a (n).

• atom

• molecule

A single unit of an ionic compound is referred to as a(n) .

• formula unit

• atom

• molecule

In lab, never dip a stirring rod into a stock reagent bottle because __.

• the reactant bottle may tip
• the stirring rod may break
• the stirring rod may puncture the reactant bottle
• the contents of the reactant bottle may become contaminated

Elements in the same column of the periodic table share the same number of __.

• protons

• neutrons

• valence electrons

• atomic mass

What is the composition of one Calcium atom?

• 20 protons, 20 electrons

• 20 protons, 40 electrons

• 40 protons, 20 electrons

• 40 protons, 40 electrons

The half-life of a radioactive isotope is 60 seconds. How long does it take for a 8.0 gram sample to decay to 0.5 grams?

• 180 seconds

• 240 seconds

• 300 seconds

• 360 seconds

Which element is known for its ability to conduct electricity and is often used in electrical wiring?

• helium

• chlorine

• copper

• phosphorus