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the atom

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Atom   the basic particle from which all elements are made  
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electron   a tiny; negatively charged particle that moves around the outside of an atom  
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nucleus   the central core of an atom which contains protons and neutrons  
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proton   small positively charged particles that are found in the nucleus of an atom  
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energy level   a region of an atom in which electrons of the same level are likely to be found  
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neutron   a small particle in the nucleus of the atom with no charge  
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atomic number   the number of protons in the nucleus of an atom  
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isotope   an atom with the same number of protons and different number of neutrons from the other atoms of the same element  
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mass number   the sum of protons and neutrons in the nucleus of an atom  
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atomic mass   the average mass of all the isotopes of an element  
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periodic table   an arrangement of the elements showing the repeating of their properties  
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chemical symbol   one or two letter representation of an element  
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period   a horizontal row of elements in the periodic table  
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group   elements in the same vertical column of the periodic table  
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