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 Atoms Structure 40 Flashcards |
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What is the smallest particle of matter that cannot be divided? |
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Atom |
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Which of the following particles is negatively charged? A) Proton B) Neutron C) Electron D) Nucleon |
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C) Electron |
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Riddle: I have no charge and am found in the nucleus alongside my positively charged friend. What am I? |
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Neutron |
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True or False: An atom can exist independently without combining with other atoms. |
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False. Atoms cannot exist alone; they combine with other atoms to form substances. |
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The total number of protons and neutrons in an atom's nucleus is called ______. |
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Mass number |
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What is the term for a positively charged ion formed by losing electrons? |
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Cation |
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Which of the following molecules is an example of a diatomic molecule? A) H₂O B) O₃ C) N₂ D) P₄ |
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C) N₂ |
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Fill in the blank: Valency is the ability of an element to combine with another by ______ or ______ electrons. |
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Donating; accepting |
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True or False: Noble gases have a valency of 1. |
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False. Noble gases have a valency of 0. |
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What is the term for a group of atoms acting as a single unit and carrying a charge? |
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Radical |
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Riddle: I form when atoms of two different elements combine in a fixed proportion by mass. What am I? |
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Molecule of a compound |
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What is the atomicity of ozone (O₃)? |
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Triatomic |
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Which element has a variable valency of 1 or 2? A) Iron B) Sodium C) Oxygen D) Magnesium |
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A) Iron |
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Fill in the blank: The periodic table arranges elements by increasing ______. |
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Atomic numbers |
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What is the chemical formula for sodium chloride? |
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NaCl |
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True or False: Molecules of an element contain atoms of different elements. |
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False. Molecules of an element contain atoms of the same element. |
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What do we call the number of atoms in a molecule of an element? |
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Atomicity |
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Which of the following is a trivalent element? A) Magnesium B) Aluminium C) Sodium D) Oxygen |
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B) Aluminium |
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Fill in the blank: A molecule is the smallest unit of an element or compound made of ______ or more atoms. |
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Two |
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Riddle: I am found in the periodic table, known for my stable nature, and I don't like to bond. What am I? |
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Noble gas |
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