Quiz on Atoms and Elements

An atom is defined as:

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

• A large molecule composed of many atoms

• A type of chemical bond

• A subatomic particle with no charge

Electrons are attracted to which type of electric charge?

• Positive charge

• Negative charge

• Neutral charge

• No charge

Explain what is meant by the term element and give an example of one.

• A substance that cannot be broken down into simpler substances; e.g., Oxygen

• A mixture of two or more substances; e.g., Air

• A compound formed by chemical reactions; e.g., Water

• A solution of metals; e.g., Steel

A molecule is defined as:

• A group of atoms bonded together

• A single atom

• A type of chemical reaction

• A phase of matter

Define the term valency.

• The number of protons in an atom

• The number of electrons in the outer shell of an atom

• The ability of an atom to combine with other atoms

• The atomic mass of an element

What is the charge of a proton?

• Positive

• Negative

• Neutral

• No charge

Which of the following is a characteristic of a chemical element?

• It can be broken down into simpler substances

• It is composed of only one type of atom

• It is a mixture of different compounds

• It is always in a gaseous state

What is the role of neutrons in an atom?

• They determine the chemical properties of an element

• They provide stability to the nucleus

• They carry a positive charge

• They orbit around the nucleus

Which statement best describes Image 'A'

• Pure element – only one type of atom present

• Mixture of two elements – two types of uncombined atoms present

• Pure compound – only one type of compound present

• Mixture of two compounds – two types of compound present

• Mixture of a compound and an element

Which statement best describes Image 'B'

• Pure element – only one type of atom present

• Mixture of two elements – two types of uncombined atoms present

• Pure compound – only one type of compound present

• Mixture of two compounds – two types of compound present

• Mixture of a compound and an element