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en.wikipedia.org/wiki/Atom

Atom, from the Greek word atomos, which means indivisible, was first conceived around 2,400 .... 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

Aug 8, 2017 ... Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it ...

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.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.

www.chem4kids.com/files/atom_structure.html

Chem4Kids.com! This tutorial introduces atomic structure in chemistry. Other sections include matter, elements, the periodic table, reactions, and biochemistry.

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 ...

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.