Atoms and Molecules Review Quiz

What is a group in the periodic table?

• A column of the periodic table.

• A row of the periodic table.

• A section of metals.

• A type of chemical bond.

What is the smallest unit of an element?

• Atom

• Molecule

• Compound

• Mixture

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What happens to the size of atoms as you move down the periodic table?

• The size increases.

• The size decreases.

• The size remains the same.

• The size fluctuates.

What are valence electrons?

• Electrons in the innermost energy level

• Electrons in the outermost energy level

• Electrons in the nucleus

• Electrons in the second energy level

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What is a chemical bond?

• A physical force that separates atoms

• An attractive force that holds 2 atoms together in a molecule

• A force that repels atoms

• A bond that only occurs in metals

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How many protons and neutrons does Carbon-12 have?

• 6 protons and 6 neutrons

• 6 protons and 7 neutrons

• 7 protons and 6 neutrons

• 7 protons and 7 neutrons

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What is an example of a compound?

• H2O (water)

• O2 (oxygen)

• N2 (nitrogen)

• He (helium)

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How many bonds are in a water molecule?

• 2

• 1

• 3

• 4

Which of the following is true about elements?

• Made up of more than one kind of atom

• Always a molecule

• Made up of only one kind of atom

• Can vary throughout (heterogeneous)

What is a characteristic of mixtures?

• Made up of only one kind of atom

• Uniform properties throughout

• Made up of more than one kind of molecule or element that have not chemically reacted

• Always a molecule