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en.wikipedia.org/wiki/Atom

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical .... A consequence of using waveforms to describe particles is that it is mathematically impossible to obtain precise values for ... In the Standard Model of physics, electrons are truly elementary particles with no internal structure.

www.livescience.com/37206-atom-definition.html

Jun 5, 2013 ... Atoms are the basic units of matter and the defining structure of elements. Atoms are made up of three particles: protons, neutrons and ...

www.vtaide.com/png/atom.htm

All matter is made up of atoms. An atom is like a tiny solar system. In the center of the atom is the nucleus which is a cluster of protons and neutrons. The protons ...

chemistry.tutorvista.com/inorganic-chemistry/structure-of-an-atom.html

The atomic structure was first described by scientists John Joseph Thomson and Ernest in 1900. This model of atom is still used as basis of modern atomic ...

www.chemistry.ohio-state.edu/~woodward/ch121/ch2_atoms.htm

The text provides a historical perspective of how the internal structure of the atom ... is much more convenient to use than grams for describing masses of atoms.

www.nyu.edu/pages/mathmol/textbook/atoms.html

STRUCTURE OF THE ATOM. Matter has mass and takes up space. Atoms are basic building blocks of matter, and cannot be chemically subdivided by ordinary  ...

www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/atomic/atomstrucrev1.shtml

A secondary school revision resource for AQA GCSE Additional Science about atomic structure and bonding.

.ask.com/youtube?q=Describe+the+Structure+of+an+Atom&v=aY01yz18ahE
Dec 8, 2014 ... An atom is the smallest particle o matter that has an independent existence. It is too small to be viewed even under a powerful microscope.

socratic.org/questions/what-is-the-basic-structure-of-an-atom

Dec 4, 2016 ... An atom contains subatomic particles called protons, neutrons, and electrons. The basic structure of an atom includes a tiny, relatively massive ...

chemistry.tutorcircle.com/inorganic-chemistry/structure-of-an-atom.html

Describe the Structure of an Atom; Basic Structure of an Atom; Explain the Structure of an Atom; Subatomic Structure of an Atom; Properties of an Atom; Law of ...