Exploring the Periodic Table: Key Concepts and Trends

Who is credited with the invention of the modern periodic table?

• Marie Curie

• Isaac Newton

• Dmitri Mendeleev

• Albert Einstein

How are elements arranged in the periodic table?

• By increasing atomic mass

• By increasing atomic number

• Alphabetically

• By date of discovery

What is the term for the horizontal rows in the periodic table?

• Groups

• Periods

• Blocks

• Series

Which element is an exception among metals for being in a liquid state at room temperature?

• Gold

• Iron

• Mercury

• Copper

What are the elements called that have properties of both metals and nonmetals?

• Metalloids

• Transition metals

• Alkali metals

• Noble gases

Which group of elements is known for having one valence electron?

• Halogens

• Alkaline earth metals

• Noble gases

• Alkali metals

What is the most active element in the alkali metals group?

• Lithium

• Sodium

• Francium

• Potassium

Which group of elements is known for being diatomic and poisonous?

• Noble gases

• Halogens

• Alkaline earth metals

• Transition metals

What are the elements in group 18 commonly called?

• Transition metals

• Halogens

• Alkali metals

• Noble gases

Why are the lanthanides and actinides placed separately at the bottom of the periodic table?

• They are not metals

• They are gases

• To fit the table on a regular-sized paper

• They have no valence electrons