Look up: atom

1. 
   Atom
   The smallest particle of an element
   Found on http://home.nas.net/~dbc/cic_hamilton/di
   
   
2. 
   Atom
   Everything is made up of tiny atoms. An atom is the smallest part of an element that has the properties of that element.
   Found on http://www.enchantedlearning.com/subject
   
   
3. 
   Atom
   An atom is the smallest quantity of a chemical element which can enter into combination or take part in a chemical reaction.
   Found on http://www.encyclo.co.uk/nol.php
   
   
4. 
   Atom
   The constituent of Elements - the smallest building block which can combine chemically with other atoms and therefore form compounds.
   Found on http://www.ionactive.co.uk/glossary_atoz
   
   
5. 
   atom
   [n] - (physics and chemistry) the smallest component of an element having the chemical properties of the element 2. [n] - (nontechnical usage) a tiny piece of anything
   Found on http://www.webdictionary.co.uk/definitio
   
   
6. 
   Atom
   The smallest unit capable of combining with another, an atom is a particle capable of combining with another.
   Found on http://www.anson.co.uk/oilfield_glossary
   
   
7. 
   Atom
   The smallest particle which makes up a specific substance. It's composed of a center around which electrons revolve.
   Found on http://www.testing1212.co.uk/a.htm
   
   
8. 
   Atom
   The basic structure of which all matter is made. It is made up of three particles; protons and neutrons (which make up the nucleus) and electrons (which orbit the nucleus). (The one exception to this is hydrogen which has only a proton at its nucleus. In its basic state an atom will form an element, the kind of element being dictated by the structure's atomic number. For example, a hydrogen atom will normally have 1 of each particle and its atomic number is 1. A helium atom, which has the atomic number 2, will have two of each particle, and so on. Atoms may be broken up (fission) or fused with another (fusion). Any combination of atoms will form a molecule.
   Found on http://www.delscope.demon.co.uk/astronom
   
   
9. 
   Atom
   The smallest portion of an element that can combine chemically with other atoms.
   Found on http://www.shponline.co.uk/glossary.asp?
   
   
10. 
    Atom
    The smallest particle of an element that can exist and still retain the ordinary chemical properties of that element. See also: Absorption Spectrum, Atomic weight, Aufbau Principle, Electron Affinity, Hunds Rule, Nucleus, Orbital, Valence Electrons.
    Found on http://www.diracdelta.co.uk/science/sour
    
    
11. 
    atom
    (Learning Modules / Chemistry / Polymers) The simplest unit which defines a particular element. Atoms are made up of protons, an equal number of electrons, and neutrons. Different atoms differ in their number of protons and electrons.
    Found on http://www.makingthemodernworld.org.uk/l
    
    
12. 
    Atom
    A particle of matter which cannot be broken up by chemical means. Atoms have a nucleus consisting of positively-charged protons and uncharged neutrons of the same mass. The positive charges on the protons are balanced by a number of negatively-charged electrons in motion around the nucleus
    Found on http://www.world-nuclear.org/info/inf51.
    
    
13. 
    Atom
    The smallest particle of an element.
    Found on http://www.allchemicals.info/index/actio
    
    
14. 
    Atom
    The smallest part of an element that retains its properties. It is possible to 'split' the atom up further into components; protons - which have a positive charge, electrons, which have a negative charge and neutrons which have no charge. The simplest atom is hydrogen, which consists of a single proton nucleus and has a single electron forming an orbit or shell around the proton. The next simplest is helium, with two protons and two neutrons in the nucleus with two electrons orbiting within the shell - see selow for diagram:
    Found on http://www.ch.ic.ac.uk/vchemlib/mol/glos
    
    
15. 
    atom
    Compare with molecule and ion. An atom is the smallest particle of an element that retains the chemical properties of the element. Atoms are electrically neutral, with a positively charged nucleus that binds one or more electrons in motion around it.
    Found on http://antoine.frostburg.edu/chem/senese
    
    
16. 
    Atom
    The smallest part of an element that retains its properties. It is possible to split the atom up further into components; protons - which have a positive charge, electrons, which have a negative charge and neutrons which have no charge. The simplest ato
    Found on http://www.chemicalglossary.net/definiti
    
    
17. 
    ATOM
    is the smallest particle of a chemical element.
    Found on http://www.chemicalglossary.net/definiti
    
    
18. 
    Atom
    Atom is the basic building block of chemistry. Atoms, also called chemical elements, can combine with one another to form compound. It is the smallest unit of matter that cannot be decomposed into simpler substances by ordinary chemical processes.
    Found on http://www.chemicalglossary.net/definiti
    
    
19. 
    Atom
    The smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons).
    Found on http://www.chemicalglossary.net/definiti
    
    
20. 
    Atom
    the smallest particle of an element which can exist alone or enter into a chemical combination.
    Found on http://www.chemicalglossary.net/definiti
    
    
21. 
    Atom
    The smallest unit of an element which has all the properties of the element. It is composed of protons, neutrons and electrons.
    Found on http://www.chemicalglossary.net/definiti
    
    
22. 
    atom
    The smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons).
    Found on http://www.shodor.org/UNChem/glossary.ht
    
    
23. 
    atom
    The smallest unit of a chemical element, about a third of a nanometer in diameter. Atoms make up molecules and solid objects.
    Found on http://www.nano.org.uk/nano/glossary.htm
    
    
24. 
    Atom
    The smallest unit of en element which still retains the chemical characteristics of that element. An atom is made up of protons and neutrons in a nucleud surrounded by electrons. A molecule of water (H20) consists of two atoms of hydrogen and one atom of oxygen
    Found on http://www.fire.org.uk/glossary.htm
    
    
25. 
    atom
    The building blocks of matter. Once thought to be indivisible particles*, atoms are now understood to consist of electrons*, protons* and neutrons*.
    Found on http://www.gcse.com/glos.htm