Science Flashcards
can be generally described as an attraction between two or more atoms.
Chemical bonds
in 1916, the concept of valence electrons was introduced
by Lewis.
GILBERT NEWTON
Two Types of Electron
Valence Electrons
Core Electrons
are those in the outermost shell or energy level
of an atom
these determine the chemical properties of an
element
VALENCE ELECTRONS
the remaining electrons in an atom that do not
effect its chemical behavior
CORE ELECTRONS
are shiny elements which are good conductors of electricity. They
have a giant structure and their atoms are arranged in a regular pattern.
Metals
form strong covalent bonds with other non-metal atoms. Whilst covalent
bonds are strong, the resultant simple molecules have low melting and boiling points, due
to weak intermolecular forces between molecules.
Non-metals
is the strong attraction between oppositely charged ions.
ionic bond
The electrons from the outer shell of metal atoms, become delocalised. They
are free to move.
METALLIC
BONDING
become positively charged ions by losing electrons.
Metal atoms
become negatively charged ions by gaining electrons.
Non-metal atoms
is formed when two atoms share a pair of electrons. Usually each atom
contributes one electron from their outer shell, but some atoms can react to make multiple
covalent bonds.
covalent bond
Equal Sharing
No electronegativity Difference
Exist two non metal
NON POLAR
Unequal Sharing
Electronegativity difference
POLAR COVALENT
it is made up of atoms of only
two nonmetallic elements .
Binary
Molecular
Compound
Number of atoms (1)
mono
Number of atoms (2)
di
Number of atoms (3)
tri
Number of atoms (4)
tetra
Number of atoms (5)
pentra
Number of atoms (6)
hexa
Number of atoms (7)
hepta
Number of atoms (8)
octa
Number of atoms (9)
nona
Number of atoms (10)
deca
is responsible for establishing
unambiguous and consistent naming
systems (also known as nomenclature)
and terminology.
It has a system for naming chemical
compounds that provides a standard
language for scientists worldwide.
IUPAC
is a substance containing
two or more elements that are
chemically bonded.
compound
is an expression
showing the elements in a compound
and their relative proportions.
chemical formula
is composed of a metal and non-metal.
ionic compound
has two or more non-metals.
covalent compound
