Front

What is the only metal that is a liquid at room temperature?

Back

Mercury

Front

Who arranged the elements according to increasing atomic masses and discovered the law of octaves?

Back

John Newlands

Front

What term describes elements that have characteristics of both metals and nonmetals?

Back

Metalloids

Front

Who is credited with developing the first ordered table of elements?

Back

Dmitri Mendeleev

Front

Which element has the greater first ionization energy, Lithium (Li) or Francium (Fr)?

Back

Lithium (Li)

Front

What is the periodic table?

Back

A tabular arrangement of the chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Front

What is atomic mass?

Back

The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

Define ionization energy.

Back

The energy required to remove an electron from an atom or ion in its gaseous state.

Front

What are metalloids?

Back

Elements that have properties intermediate between metals and nonmetals.

Front

What is the significance of Dmitri Mendeleev's periodic table?

Back

He organized elements by increasing atomic mass and predicted the properties of undiscovered elements.