Flashcard on the Organization of the Periodic Table

Front

What do the atomic masses in square brackets indicate about the elements?

Back

They have unstable, radioactive isotopes.

Front

Which element is located in period 1 group 18 of the periodic table?

Back

Helium.

Front

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

Back

Metalloids.

Front

Which group of elements is referred to as the alkali metals?

Back

Group 1.

Front

What is the common name for the elements found in group 18?

Back

Noble gases.

Front

What is the general trend in atomic size as you move down a group in the periodic table?

Back

Atomic size increases as you move down a group.

Front

What is the general trend in ionization energy as you move across a period from left to right?

Back

Ionization energy increases as you move from left to right across a period.

Front

What are the characteristics of alkali metals?

Back

They are highly reactive, have one electron in their outer shell, and are soft.

Front

What distinguishes noble gases from other elements in the periodic table?

Back

Noble gases are inert and have a full valence shell, making them very stable.

Front

What is the significance of metalloids in the periodic table?

Back

Metalloids have properties that are intermediate between metals and nonmetals, making them useful in semiconductors.