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Module 2 Foundations in Chemistry
Chapter 2 Atoms, ions and compounds
2.1 Atomic structure and isotopes
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Atoms are made from
subatomic
particles called
protons
,
neutrons
and
electrons
Protons
and
neutrons
are located in the
nucleus
of the atom while
electrons
are located in the
outer shell
of the atom
Relative mass of protons and neutrons are
1
, and
1/2000
for electrons
Relative charge of a proton is
+1
Relative charge of a neutron is
0
Relative charge of an electron is
-1
Isotopes are
atoms
of the same
element
with different number of
neutrons
Chemical properties
of an
element
are determined by the number of
electrons
in the
outer shell