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| Democritus believe that the universe was made up empty spaces and ______ |
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| What 19th-century scientist designed the atomic theory of matter? |
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| Why did JJ Thomson conclude that cathode were negatively charged? |
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| The rays ent towards the positively charged plate |
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| The small negatively charged particles discovered by JJ Thomson are called _________. |
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| In his experiments with gold foil, why did Rutherford conclude that the gold atoms contain some positively charged objects? |
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| Some of the alpha particles bounced off the gold foil instead of passing through |
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| Atoms of the same element that have different numbers of neutrons call ______ |
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| And elements atomic number is the number of _______ in the nucleus of each atom of that element |
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| The atomic number for manganese is 25; it's mass number is 55. How many neutrons does an atom of manganese have an its nucleus? |
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| Most of an atom's mass is contained in _________. |
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| ______ is the release of nuclear particles and energy |
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| Which of these is NOT found in the nucleus in the atom? |
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| Most of the volume of an atom is occupied by ________. |
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| When determining an element's identity, what is the most important subatomic part to examine? |
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