Chap 2, Part 2
are specific combinations of elements.
Compounds are classified as
either molecular or ionic.
, is a neutral group of atoms that are bonded
The types of atoms present in a molecular compound are represented by
molecular and empirical formulas.
is a chemical formula that shows the
smallest whole-number ratio of atoms in the compound.
composition of a molecule in
terms of the number of atoms of each element present in a single molecule.
The arrangement of atoms in a molecule is represented by a
In a structural formula, the atoms are represented by their symbols, and lines
show which atoms are bonded together.
consists of positively charged ions, cations, and
negatively charged ions, anions, stacked together so that the number of positive and
negative charges is equal.
is the simplest collection of positive and
negative ions from which an ionic compound’s formula can be established.
Ions can be
, meaning that they consist of a single atom, or
, meaning that they consist of more than one atom bonded together.
Metallic elements typically form
, and their charges are
related to the group to which they belong in the periodic table.
Only few nonmetallic elements (H, N, O, P, S, Se, F, Cl, Br, I) form
, and their charges are related to the group to which they