An element is a substance consisting of
atoms which all have the same number
of protons - i.e. the same atomic
number.
The sub-atomic structure of a carbon atom
A table to show relative charges
A chemical bond is a mutual
attraction between two atoms
resulting from a redistribution of
their outer electrons.
An element is an
atom or molecule
made of a single type
of atom. A compound
is a molecule made of
two or more different
elements.
Atoms
The
overall
charge of
an atom is
0
The number of
protons in the
nucleus is equal to
the number of
electrons
All atoms of an element
have the same number
of protons.
Atoms of different
elements have different
numbers of protons
Atoms are arranged in
the modern periodic
table in order of their
atomic number (proton
number)
Chemical bonding
involves either
transferring or sharing
electrons in the highest
occupied energy levels
of atoms.
Elements in group 1 of the periodic table
all have similar chemical properties.
They all react with non-metal elements to
form ionic compounds in which the metal
has a single negative charge.
Elements in group 7 of the periodic table,
the halogens have similar chemical
properties. They react with alkali metals to
form ionic compounds in which the halide
ions hhave a single negative charge.