Atoms and Molecules

The positive particles of an atom are ___________.

• Neutrons

• Electrons

• Nucleus

• Protons

The center of an atom where its neutrons and protons are is called the _____________.

• Protons

• Electron Cloud

• Nucleus

• Neutrons

Which is an electron?

• a

• b

• c

Atoms bond together in different ways to make ________________.

• matter

• elements

• atoms

• molecules

Which statement best describes an element?

• made of a mixture

• made of only one type of atom

• made of multiple atoms

• a substance

What is the term for combining 2 or more DIFFERENT atoms together?

• molecule

• element

• compound

• mixture

What are the 3 particles that make-up the atom?

• nucleus, protons, electrons

• protons, neutrons, electrons

• positive, negative, neutral

• electrons, electron cloud, nucleus

How many atoms are there in a molecule?

• 1

• 2 or more

• exactly 18

• 3

How many hydrogen atoms are there in a water molecule? 

• 3

• 1

• 2

• none

Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 3

• 1

• -1

• 2