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28 Cards in this Set
- Front
- Back
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Define valence electrons.
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The electrons in the highest occupied energy level of an atom are known as valence electrons.
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Define valence electrons.
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The electrons in the highest occupied energy level of an atom are known as valence electrons.
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Elements in the same group of the periodic table have similar chemical properties because....
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Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons.
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Elements in the same group of the periodic table have similar chemical properties because....
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Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons.
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Describe the octet rule.
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In forming compounds, atoms aim to achieve a noble gas configuration. Noble gases are extremely unreactive and stable because their valence electrons occur in sets of 8, hence the term octet rule.
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Describe the octet rule.
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In forming compounds, atoms aim to achieve a noble gas configuration. Noble gases are extremely unreactive and stable because their valence electrons occur in sets of 8, hence the term octet rule.
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Electron dot structures are used to model....
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Electron dot structures are used to model valence electrons.
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Electron dot structures are used to model....
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Electron dot structures are used to model valence electrons.
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How are ions formed?
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Ions are formed when atoms gain or lose electron.
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How are ions formed?
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Ions are formed when atoms gain or lose electron.
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What are the charges of ionic compounds? Why is this so?
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Ionic compounds are electrically neutral, because they are formed by atoms with opposite but equal charges, which cancel each other out.
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What are the charges of ionic compounds? Why is this so?
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Ionic compounds are electrically neutral, because they are formed by atoms with opposite but equal charges, which cancel each other out.
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Atoms of metallic elements tend to ____ their valence electrons.
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Atoms of metallic elements tend to lose their valence electrons.
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Atoms of metallic elements tend to ____ their valence electrons.
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Atoms of metallic elements tend to lose their valence electrons.
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What are cations?
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Cations are positively charged ions, which are formed when atoms lose electrons.
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What are cations?
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Cations are positively charged ions, which are formed when atoms lose electrons.
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What are anions?
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Anions are negatively charged ions, which are formed when atoms gain electrons.
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What are anions?
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Anions are negatively charged ions, which are formed when atoms gain electrons.
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Why are metals malleable?
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Metals are malleable (can be hammered into sheets) because their atoms are surrounded by delocalized, or unattached, electrons. These free floating electrons act as a barrier between atoms, whose positive nuclei may repel each other.
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Why are metals malleable?
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Metals are malleable (can be hammered into sheets) because their atoms are surrounded by delocalized, or unattached, electrons. These free floating electrons act as a barrier between atoms, whose positive nuclei may repel each other.
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What is a formula unit?
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A formula unit is the simplest whole number ration of one type of atoms to another in a specific compound.
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What is a formula unit?
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A formula unit is the simplest whole number ration of one type of atoms to another in a specific compound.
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Describe the properties of ionic compounds.
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Ionic compounds
-are crystalline solids at room temperature -have high melting points - are good conductors of electricity when dissolved in water or melted. |
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Describe the properties of ionic compounds.
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Ionic compounds
-are crystalline solids at room temperature -have high melting points - are good conductors of electricity when dissolved in water or melted. |
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Why are ionic compounds good conductors of electricity in their liquid state only?
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Liquids can flow, while solids can't. Electricity is the flow of electrons from one place to another, so said electrons must be free to move.
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Why are ionic compounds good conductors of electricity in their liquid state only?
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Liquids can flow, while solids can't. Electricity is the flow of electrons from one place to another, so said electrons must be free to move.
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Define a chemical formula.
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A chemical formula shows the types and amounts of atoms present in a substance. (NaCl is an example).
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Define a chemical formula.
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A chemical formula shows the types and amounts of atoms present in a substance. (NaCl is an example).
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