Chemical composition – Atomic structure​ ​

What is an atom?

• A chemical bond that involves the sharing of electrons between atoms

• A substance that cannot be broken down into any other substance

• A group of two or more atoms

• The smallest unit of matter that has the characteristic properties of a chemical element

What is the structure of an atom?

• Consists of a nucleus with protons and neutrons, and electrons arranged in shells around the nucleus

• Consists of a stable balance of attractive and repulsive forces between atoms

• Consists of a single valence electron

• Consists of positively charged ions and negatively charged anions

What is the valence shell of an atom?

• The outermost shell consisting of valence electrons

• A group of two or more atoms

• The nucleus with protons and neutrons

• A chemical bond that involves the sharing of electrons between atoms

What are ions?

• A chemical bond that involves the sharing of electrons between atoms

• A group of two or more atoms

• Any atom or group of atoms that bears one or more positive or negative electrical charges

• A substance that cannot be broken down into any other substance

What is covalent bonding?

• The smallest unit into which a pure substance can be divided

• A group of two or more atoms

• The outermost shell consisting of valence electrons

• A chemical bond that involves the sharing of electrons between atoms to form electron pairs

What is a molecule?

• A chemical bond that involves the sharing of electrons between atoms

• A substance that cannot be broken down into any other substance

• The smallest unit into which a pure substance can be divided

• A group of two or more atoms

What are elements?

• The smallest unit into which a pure substance can be divided

• A chemical bond that involves the sharing of electrons between atoms

• A group of two or more atoms

• Substances that cannot be broken down into any other substance

What does the periodic table list?

• The smallest unit into which a pure substance can be divided

• All the elements grouped together according to their similar properties

• The outermost shell consisting of valence electrons

• A group of two or more atoms

What are valency and valence shell used to determine?

• A chemical bond that involves the sharing of electrons between atoms

• The binding capacity of an atom or radical when it combines with another chemical species

• A group of two or more atoms

• The smallest unit into which a pure substance can be divided

What is the mass of an electron compared to a proton or neutron?

• About 1/2000 of the mass of a proton or a neutron

• The outermost shell consisting of valence electrons

• A chemical bond that involves the sharing of electrons between atoms

• A group of two or more atoms