How are compounds formed?

What's different about isotopes?

Which type of bonding lose or gain electrons to form ions?

What are charged particles known as?

Describe the periodic groups/shell which is willing to gain electrons?

What do ionic compounds always have?

Why do ions form a closely packed regular lattice arrangement?

Do ionic compounds have a high melting/boiling point or a low melting/boiling point? why?

When ionic compounds melt and ions are free to move what can they do?

What is the overall charge of any compound?

What is a covalent bond?

What does each covalent bond provide?

What is different about the covalent bond between two oxygen atoms?

Simple molecular substances don't conduct electricity, what does this mean?

Simple molecular forces of attraction between molecules are weak. What does this mean?