Ionic, metallic, and covalent bonding Flashcards Preview

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Flashcards in Ionic, metallic, and covalent bonding Deck (29):
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Rows

Periods

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Columns

Groups

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General characteristics of metals

•good conductors of heat
•tend to loose electrons
•become cation
•80% of elements are metals
•made up of closely packed cations instead is neutral atoms

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General characteristics of non metals

•poor conductors of heat and electricity
•tend to gain electrons
•become anions

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General characteristics of metalloids

•intermediate between metals and non metals
•physical and chemical properties in common with both

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Valence electrons

The electrons in the highest occupied energy level of an elements atom

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Lewis dot structures and electron dot structures

•same thing
•used to represent the valence electrons of an atom as dots

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Determining the number of valence electrons

Look at the group number on the periodic table

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Ion

Atom with a positive or negative charge

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Electron affinity

The measure of an atoms tendency to gain an electron

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Cations

•positive ions
•smaller
•form when an atom looses and electron or electron
•usually metals

Name- (element name) ion
(Element name) cation

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Anions

•negative ions
•larger
•usually nonmetals

Name- ex. Chlorine -----> chloride

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Ionization energy

The energy required to remove an electron from an atom

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Ionic compound

Have no charge

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Electrostatic force

Attraction between positive and negative charges

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Why scientists use chemical formulas

The chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance

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Formula unit

The lowest whole number ratio Of ions in an ionic compound

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Properties of an ionic compound

•most ionic compounds are crystalline solids at room temperature
•generally have high melting points
•conduct electricity when melted or dissolved in water

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Covalent bond

A bond that holds atoms together that is created by sharing electrons

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Molecule

A neutral group of actions joined together by covalent bonding

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General characteristics of molecular compound

• a compound composed of molecules
•tend to have a lower melting point and boiling point than Ionic compound
•most are either a gas or liquid at room temperature
•most are composed to atoms of non-metals

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Single covalent bond

Two atoms held together by sharing a pair of electrons

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Double covalent bonds

Covalent bond that involves two shared pairs of electrons

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Triple covalent bond

Covalent bond that involves three shared pairs of electrons

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Electrons not shared In a covalent bond

•lone pair
•unshared pair
•mom bonding pair

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A shared pair of electrons in a covalent bond is represented with a

A dash

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Compounds containing polyatomic ions contain

Ionic and covalent bonding

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Formula for hydrogen peroxide

H2O2

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Formula for sulfur dioxide

SO2