Structure and Bonding 1.37-1.60C
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What is an ion and how are they formed?
Charged particle Formed by gain or loss of electrons which dictates the charge of an ion
What is a cation and how is it formed?
Positive ions - lose electrons
What is an anion and how is formed?
Negative ion - gain electrons
How do groups 1,2 and 3 (metals) form ions?
Lose electrons to form positive ions Group 1 = 1+ Group 2 = 2+ Group 3 = 3+
How do groups 5,6, and 7 (non-metals) form ions?
Gain electrons to form negative ions Group 5 = 3- Group 6 = 2- Group 7 = 1-
What is the charge of Ag?
+
What is the charge of Cu?
2+
What is the charge of Fe (II)?
2+
What is the charge of Fe (III)
3+
What is the charge of Pb?
2+
What is the charge of Zn?
2+
What is the charge and formula of hydrogen?
H+
What is the charge and formula of hydroxide?
OH-
What is the charge and formula of ammonium?
NH4+
What is the charge and formula of carbonate?
CO3^2-
What is the charge and formula of nitrate?
NO3^-
What is the charge and formula of sulfate?
SO4^2-
What happens when a metal reacts with a non-metal?
Ionic compound Metal loses electrons = Positive ion Non-metal gains electrons = Negative ion These ions are strongly attracted to one another by electrostatic attractions - ionic bond
Define ionic bond
The strong electrostatic force of attraction between positive and negative ions
How are ionic compounds represented?
Dot and cross diagrams
What structure do ionic compounds have?
Giant ionic lattice
Why do ionic compounds have high melting and boiling points?
Structure - they have a giant ionic lattice structure Bonding - Held together by the strong electrostatic force of attraction between positive and negative ions Energy - a large amount of energy is required to break the attraction to melt the substance
Can ionic compounds conduct electricity and why?
Can in solution and molten NOT solid Solid - ions are fixed in the lattice (no charged particles can move) Molten and solution - ions no longer fixed and free to move
What are the conditions for electricity?
Charged particles that can move