Ch5.4 Flashcards
(15 cards)
What is an atomic element?
An element that exists as single, individual atoms (e.g., Fe, He).
How do you know an element is atomic in its formula?
There is no subscript after the symbol, indicating only one atom.
What is a molecular element?
An element that exists naturally as molecules (e.g., H₂, O₂, P₄, S₈).
What are the seven diatomic molecular elements?
H₂, O₂, N₂, F₂, Cl₂, Br₂, I₂.
What is a molecular compound?
A compound made of only nonmetals or semi-metals with nonmetals, held together by covalent bonds.
What is the basic unit of a molecular compound?
A molecule.
What is an ionic compound?
A compound made from a metal and a nonmetal (or semi-metal), involving ionic bonds.
What is the basic unit of an ionic compound?
A formula unit.
Classify: Fe
Atomic element.
Classify: PCl₃
Molecular compound.
Classify: LiBr
Ionic compound.
Classify: P₄
Molecular element.
Classify: O₂
Molecular element.
Classify: H₂O
Molecular compound.
Classify: CuCl
Ionic compound.
