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 Atomic Structure 40 Flashcards |
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What are the three main subatomic particles that make up an atom? |
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Electrons, protons, and neutrons. |
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Which scientist proposed that all matter is made of tiny particles called atoms? |
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Democritus. |
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Riddle: I am the smallest unit of matter, indivisible, and my name comes from the Greek word for 'indivisible'. What am I? |
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Atom. |
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True or False: The mass of an electron is approximately equal to that of a proton. |
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False. A proton is about 1840 times heavier than an electron. |
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Fill in the blanks: The positively charged particles in an atom are called ______. |
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Protons. |
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In which year did John Dalton propose his atomic theory? |
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1808. |
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Which particle was discovered by Sir J.J. Thomson? |
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Electron. |
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What is the charge of a proton? |
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Positive charge. |
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Riddle: I am a particle in the nucleus, have no charge, and help make the atom stable. What am I? |
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Neutron. |
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True or False: Anode rays are made of negatively charged particles. |
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False. Anode rays are made of positively charged particles. |
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Fill in the blanks: The central part of an atom, where protons and neutrons are found, is called the ______. |
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Nucleus. |
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What does the atomic number (Z) represent in an atom? |
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The number of protons in the nucleus. |
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Which model of the atom proposed by J.J. Thomson is known as the plum pudding model? |
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Thomson's model. |
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Riddle: I am the part of the atom that orbits the nucleus and have a negative charge. What am I? |
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Electron. |
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True or False: The number of neutrons can vary in isotopes of the same element. |
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True. |
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Fill in the blanks: The total number of protons and neutrons in an atom is called its ______. |
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Mass number. |
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What is the electron configuration for lithium (atomic number 3)? |
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2, 1. |
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Which scientist discovered the neutron? |
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James Chadwick. |
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What is the maximum number of electrons that can occupy the M shell? |
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18 electrons. |
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Fill in the blanks: The outermost shell of an atom is known as the ______ shell. |
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Valence. |
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