Review

How are elements similar to those in the same group on the periodic table?

• They have the same number of valence electrons.

• They have the same number of electrons.

• They have the same number of protons.

• They have the same atomic mass.

Which choice best describes the properties of potassium (K), based on its position on the periodic table of elements?

• a nonreactive metal

• a highly reactive metal

• a nonreactive nonmetal

• a highly reactive nonmetal

Where are the most reactive metals located on the periodic table?

• the uppermost complete row of the table

• the rows at the bottom of the table connecting two section

• the column at the far left side of the table

• the second column from the right side of the table

Where are the most reactive nonmetals located on the periodic table?

• the uppermost complete row of the table

• the rows at the bottom of the table connecting two sections

• the column at the far left side of the table

• the second column from the right side of the table

Which of these is one similarity of the elements in the first group of the periodic table?

• The elements in the group have similar atomic masses

• The elements in the group have the same number of electrons.

• The elements in the group are very unreactive metals.

• The elements in the group react with oxygen in similar ways.

What was observed that led to the arrangement of sixty-three already-known elements by increasing atomic weights in the periodic table?

• A repetition occurs in chemical and physical properties.

• An atomic weight corresponds to the existing abundance.

• The number of neutrons and protons increased by one.

• The chemical compounds formed by the elements increased by one.

What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

• very high melting point

• gas state at room temperature

• good conductor of electric current

• extremely brittle solid at room temperature

Which statement BEST describes the organization of the periodic table of the elements?

• All gases are grouped together

• Gases easily form compounds with other elements.

• Elements within a group have similar properties.

• Elements within a period have the same number of electrons.

Elements in the same column of the periodic table of the elements all

• have the same number of protons.

• share the same atomic structure.

• have similar physical characteristics

• share the same number of neutrons.

Elements in the periodic table of the elements are organized into columns and rows. The columns are organized to show the

• similarities of the reactivity in groups.

• number of neutrons in a column.

• sum of atomic weights per column.

• amount of radioactivity in each group.