barbara de santis all material is on my blog at
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Barbara De SantisAll material is on my blog at www.tinyurl.com/bsdblog
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The atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons (except in the case of hydrogen-1, which is the only stable nuclide with no neutrons). The electrons of an atom are bound to the nucleus by the electromagnetic force. Likewise, a group of atoms can remain bound to each other, forming a molecule. An atom containing an equal number of protons and electrons is electrically neutral, otherwise it has a positive charge (electron deficiency) or negative charge (electron excess) and is an ion. An atom is classified according to the number of protons and neutrons in its nucleus: the number of protons determines the chemical element, and the number of neutrons determines the
isotope of the element.[1]
An atom is a basic unit that makes up all matter. There are many different types of atom each with its own name, mass and size. These are called chemical elements, such as hydrogen or gold. Atoms are very small, the exact size changes depending on the element - they range from 0.1 to 0.5 nanometers.[1] One nanometer is around a hundred times smaller than the width of a human hair. This makes atoms almost impossible to see. The way they work, and how they act with other atoms has to be seen using equations.
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