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| An element cannot be _______ or __________. |
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Definition
| an element cannot be Destroyed or Created. |
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Term
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Definition
| the number of protons in the nucleus of an atom |
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Term
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Definition
| the average mass of a single atom. Measured in atomic mass units (amu) |
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Term
Beryllium: 2 valence electrons
Flourine: 7 valence electrons
What is the compound(in symbol form)? |
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Definition
BeF2*
*the two is supposed to be subscript |
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Term
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Definition
| An attraction between atoms that holds them together in space. |
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Term
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Definition
| Electrons that are located in the inner shells, referring to the Bohr model. |
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Term
| Covalent Bond Properties: |
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Definition
-Made entirely of nonmetal atoms
-Does not dissolve in water
-Does not conduct electricity
-Very hard solids |
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Term
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Definition
| The mass per unit volume (d=m/v) |
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Term
| Element symbol for Magnesium: |
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Definition
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Term
| Element symbol for Oxygen: |
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Definition
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Term
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Definition
| A unique form of matter that serves as a building material for more complex matter. |
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Term
| How does knowing the number of valence electrons in an element help you when working with bonds? |
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Definition
| They help predict whether an ionic compound will form |
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Term
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Definition
-Made of metal and non-metal atoms
-Dissolves in water
-Conducts electricity when dissolved but not when solid
-Brittle solids |
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Term
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Definition
| Atoms of the same element but have different numbers of neutrons |
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Term
| Lanthanides and Actinides: |
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Definition
Lanthanides: rare earth elements
Actinides: most created synthetically
located in 6th & 7th periods |
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Definition
| The mass of an individual atom (isotope). |
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Term
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Definition
| The amount of stuff or substance in an object. We measure mass by measuring weight on a scale or balance. |
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Term
| Metallic Bond Properties: |
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Definition
-made of all metal atoms
-Doesn't dissolve in water
-Conducts electricity
-Bendable solids |
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Term
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Definition
| An element that has properties of both metals and nonmetals; located along boundary between metal and nonmetal on periodic table. |
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Term
| Molecular Covalent Bond properties: |
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Definition
-made of nonmetal atoms
-some dissolve in water, some don't
-doesn't conduct electricity
-tends to be liquid, gas, or soft solid |
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Term
| Name 3 ways how the periodic table is organized |
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Definition
| reactivity, number of protons, average atomic mass, metal or nonmetal, etc |
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Term
| Name the four basic chemical bonds: |
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Definition
| Ionic Bond, Network Covalent Bond, Metallic Bond, Molecular Covalent Bond. |
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Term
| Name three compounds that have a 1:1 ratio |
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Definition
Potassium Iodide (KI)
Sodium Chloride (NaCl)
Magnesium Oxide (MgO) |
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Term
| Name two reasons that the Bohr Model tells you about atoms. |
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Definition
Electrons only found around nucleus at specific distances in electron shells, &
Nucleus in center of atom |
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Term
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Definition
| The electrons contained in the valence shell |
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Term
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Definition
| The outermost shell of an atom, referring to the Bohr model |
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Term
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Definition
| The amount of space occupied by a substance. |
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Term
| What is the "8" (octet) rule that helps us when predicting whether an ionic bond will form? |
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Definition
| If the total valence electrons don't equal 8 or a multiple of 8 then an ionic bond doesn't form. |
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Term
| When working with ions, atoms tend to ________ or________ electrons so it will have the _____________________ as the ____________ nearest to it on the periodic table. |
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Definition
| When working with ions, atoms tend to lose or gain electrons so it will have the same electron configuration as the noble gas nearest to it on the periodic table. |
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Term
| Why can't we create gold? |
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Definition
| Because it is an element an elements can't be created or destroyed. |
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Term
| Why don't noble gases regularly form bonds with other elements? |
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Definition
| Their valence shell already holds the maximum amount of electrons so they aren't attracted to other elements. |
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Term
| You can find the number of valence electrons by ____________________. |
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Definition
| You can find the number of valence electrons by looking at the group number |
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