Atomic structure diagrams – some variations!
This is not correct for some elements now that we know their detailed atomic structure in terms of protons, neutrons and electrons, and of course, their chemical and physical properties in more accurate and extensive detail.
This tutorial introduces atomic structure in chemistry
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* multi–word gap–fill worksheet on atomic structure GCSE/IGCSE Foundation Atomic Structure lower tier multiple choice quiz or GCSE/IGCSE Higher Atomic Structure higher tier multiple choice quiz
Atomic Structure Concepts - HyperPhysics Concepts
The important historic alpha particle scattering experiment is described, variations of atomic structure diagrams, There is a section explaining what allotropes are, don't confuse with isotopes!
BBC - GCSE Bitesize: Atomic structure
All the atoms are the same in the structure of an element (ignoring isotopes - different numbers of neutrons, see later) and two or more different atoms/elements must be present in a compound.