Atoms and Elements Quiz 2

What is an atom?

• A large structure made of molecules

• The smallest unit of an element that retains its chemical properties

• A chemical reaction

• A substance made of two or more elements

Which statement best defines an element?

• A pure substance made of only one type of atom

• A mixture of different substances

• A substance made of two or more different atoms

• A type of molecule

What is a compound?

• A mixture of two or more substances

• A pure substance that cannot be broken down

• A substance made of two or more different elements chemically bonded

• A type of molecule

How many elements are in the periodic table?

• 100

• 114

• 150

• 200

What are the vertical columns in the periodic table called?

• Periods

• Groups

• Rows

• Elements

What are the horizontal rows in the periodic table called?

• Groups

• Periods

• Columns

• Atoms

Why are gold, silver, and copper in the same group?

• They have the same number of protons

• They are all gases

• They have similar chemical and physical properties

• They react the same way with water

What does the atomic number represent?

• The number of neutrons in an atom

• The number of protons in an atom

• The number of electrons in an atom

• The mass of an atom

What does the atomic mass represent?

• The total number of electrons in an atom

• The sum of protons and neutrons in an atom

• The charge of an atom

• The density of an atom

If two elements have the same atomic number but different mass numbers, what are they called?

• Isotopes

• Compounds

• Ions

• Metals