8 P 1 8 P 2

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.

Tags

NGSS.HS-PS1-1

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.