6.7: Materials and Their Properties

An electron is a _______ particle that orbits the nucleus.

• Positive

• Negative

• Neutral

• Charged

The nucleus of an atom contains which of the following?

• Electrons and protons

• Protons and neutrons

• Neutrons and electrons

• Electrons only.

What is the total number of elements that occur naturally on Earth?

• Nearly 50

• Nearly 94

• Nearly 118

• Nearly 200

Fill in the blank: Elements are classified as either metals, non-metals, or ______.

• gases

• liquids

• metalloids

• compounds

What are the three types of bonds that classify compounds?

• Ionic, molecular, or metallic

• Solid, liquid, or gas

• Heavy, light, or medium

• Natural, synthetic, or artificial

What is the main difference between elements and compounds?

• A) Elements are pure substances, compounds are mixtures

• B) Elements are metals, compounds are non-metals

• C) Elements are composed of one type of atom, compounds are formed by different elements

• D) Elements are synthetic, compounds are natural.

Fill in the blank: Elements are classified as either metals, non-metals, or ______.

• gases

• liquids

• metalloids

• compounds

Which element is a lanthanide?

• Lanthanum

• Actinium

• Thorium

• Uranium

Which element is an actinide?

• Thorium

• Protactinium

• Uranium

• All of the above.

Fill in the blank: In a covalent bond, atoms share ______.

• Electrons

• Protons

• Neutrons

• Ions