Horizontal row in the periodic table
Period
Vertical column in the periodic table
Group
A repetition of properties occurs when elements are arranged in order of increasing atomic number
Periodic law
Type of element that is a good conductor of heat and electric current
Transition metal
Type of element characterized by the presence of electrons in the d orbital
metal
Subatomic particles that are transferred to form positive and negative ions
electrons
Type of ion formed by group 2A elements
cation
An electron in the highest occupied energy level of an atom
Valence electron
Atoms react so as to acquire the stable electron structure of a noble gas
Octet rule
A depiction of valence electrons around the symbol of an element
Electron dot structure
An anion of chlorine or other halogen
Halide ion
The force of attraction binding oppositely charged ions together
Ionic bond
The number of ions of opposite charge surrounding each ion in a crystal
Coordination number
consists of a single atom with a positive or negative charge
Monatomic ion
Atom of group of atoms having a negative charge
Anion
Atom or group of atoms having a positive charge
Cation
Tightly bound group of atoms that behaves as a unit and carries a net charge
Polyatomic ion
Binary