Question

select the correct statement(s).
elements are organized into horizontal rows on the periodic table. they are called periods.
compounds are represented on the periodic table.
all matter is made up of one or more atoms.
elements are organized into vertical columns on the periodic table. they are called groups.
elements have unique properties.

Explanation:

• The periodic table organizes elements. Horizontal rows are periods, vertical columns are groups. Elements have unique properties. All matter is made of atoms. Compounds are not on the periodic table (it's for elements).

Answer:

• Elements are organized into horizontal rows on the periodic table. They are called periods.
• All matter is made up of one or more atoms.
• Elements are organized into vertical columns on the periodic table. They are called groups.
• Elements have unique properties.