CHEM - Structure of Atoms
Chemistry, atomic structure, neutron, proton, electron, isotope - IGCSE | IBDP | DSE | GCE | IAL | AP Chemistry
What is an atom?
Structure of Atom
Atoms are made up of subatomic particles called protons, neutrons and electrons.
Atomic number: the number of protons in an atom
Atoms can be represented as atomic symbols:
Isotope: Atoms of the same element that have different number of neutrons
For example, hydrogen has three common isotopes.
Relative Atomic Mass (Ar):
Calculating relative atomic mass of chlorine:
Chlorine exists as two isotopes in nature, (chlorine-35) and (chlorine-37). The abundance of chlorine-35 is 75%, and the abundance of chlorine-37 is 25%.
The relative atomic mass of chlorine is:
Ar = 35 x 0.75 + 37 x 0.25 = 35.5
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