Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? ...

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SECTION 2: IONIC AND COVALENT BONDING

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Transcript of Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? ...

Page 1: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

SECTION 2: IONIC AND COVALENT

BONDING

Page 2: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

KEY IDEAS

Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent

bonds share? What gives metals their distinctive

properties? How are polyatomic ions similar to

other ions?

Page 3: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

KEY TERMS

Ionic bondCovalent

bondMetallic

bondPolyatomic

ion

Page 4: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

WHY DO CHEMICAL BONDS FORM?

Generally, atoms join to form bonds so that each atom has a stable electron configuration

Ionic compounds

Covalent compounds

Structure Network of bonded ions

Molecules

Valence electrons Transferred Shared

Electrical conductivity Good (when melted or dissolved)

Poor

State at room temperature

Solid Solid, liquid, or gas

Melting and boilding points

Generally high Generally low

Page 5: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

IONIC BONDS

Ionic bonds are formed by the transfer of electrons

Ionic compounds are in the form of networks, not molecules

When melted or dissolved in water, ionic compounds conduct electricity

Video

http://socratic.org/chemistry/ionic-bonds-and-formulas/ionic-bond-formation
Page 6: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

IONIC BONDS

Page 7: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

COVALENT BONDS

A bond formed when atoms share one or more pairs of electrons

Can be solids, liquids, or gases Atoms may share more than one pair of

electrons Atoms do not always share electrons

equally.

Page 8: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

COVALENT BONDS

Page 9: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

METALLIC BONDS

Formed by the attraction between positively charged metal ions and the electrons around them.

Metals are flexible and conduct electric current well because their atoms and electrons can move freely throughout a metal’s packed structure.

Electron can move freely between metal atoms.

Page 10: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

METALLIC BONDS

Page 11: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

POLYATOMIC IONS

An ion made of two or more atoms Acts as a single unit in a compound, just as

ions that consist of a single atom do There are several common polyatomic ions

(baking soda, ammonium nitrate and sulfate) Parentheses group the atoms of a polyatomic

ion Some names relate to the oxygen content of

the anion. Video

http://socratic.org/chemistry/ionic-bonds-and-formulas/polyatomic-ions
Page 12: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

COMMON POLYTOMIC IONS

Page 13: Why do atoms form bonds? How do ionic bonds form? What do atoms joined by covalent bonds share? What gives metals their distinctive properties?

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