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Atoms and Elements

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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Question
Answer
Who discovered small negatively charged particles called electrons?   J.J. Thomson  
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Opposite charges do what with each other?   Attract  
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Like charges do what with each other?   Repel  
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What is the center of an atom which contains most of the atom's mass?   Nucleus  
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What are the positively charged particles inside an atom's nucleus called?   Protons  
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The particle that is found in the nucleus of an atom and has no electrical charge is a what?   Neutron  
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In Ernest Rutherford's "gold foil experiment", he discovered that what is mostly empty space?   An atom  
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Each energy level can hold a certain number of electrons. The first energy level is closest to what and can hold how many electrons?   Nucleus and 2  
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When the first energy level is full, electrons begin to fill the second level. The second energy level can hold how many electrons?   8  
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When the second energy level is filled, electrons go to the next higher level. The last occupied energy level might or might not be filled.   True  
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The electrons in the outermost level are called what?   Valence electron  
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These outermost electrons are in involved in what?   Chemical bonding  
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If the atoms of a substance have their outer energy levels filled, they are what? Which means, if the outer energy level is filled, the atom will not combine with another atom to form a new substance.   Unreactive  
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Atoms with partially filled outer energy levels likely or unlikely to bond with other atoms?   Likely  
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Electrons are located within an area around the nucleus called what?   Electron cloud  
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What two parts of the atom has the same mass?   Protons and Neutrons  
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What has a small mass?   Electron  
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The most mass of an atom is found in the what?   Nucleus  
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Pure substances that cannot be broken down into any simpler substance is a what?   Element  
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Each element has atoms consisting of a specific number of what?   Protons, neutrons, and electrons  
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The number of protons in an atom of an element is its what?   Atomic number  
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Atoms normally have the same or different numbers of electrons as protons?   The same  
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Atoms of the same element that have different numbers of neutrons are called what?   Isotopes  
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The sum of the number of protons and neutrons in the nucleus of an atom is the atoms what?   Mass number  
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