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It’s All A Bit Ionic!

It’s All A Bit Ionic!. Today’s Lesson. The wonders of Compounds Idyllic Ionic Bonding Experiment Write Up (Due Today) Homework Questions. Catatonic Compounds. So what’s the difference between elements and compounds?

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It’s All A Bit Ionic!

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  1. It’s All A Bit Ionic!

  2. Today’s Lesson • The wonders of Compounds • Idyllic Ionic Bonding • Experiment Write Up (Due Today) • Homework Questions

  3. Catatonic Compounds • So what’s the difference between elements and compounds? • This is what we will now be learning about. We’ll be seeing how different atoms bond and what properties then might have because of that. • For example, does anyone know why most non-metals when bonded have a low MP and BP.

  4. Elements & Compounds • Elements are one type of atom by themselves which is pure. • A compound is two or more atoms together. • Noble Gases normally don’t form compounds • Atoms like to have full outer electron shells. • If there is 1, 2 or 3 electrons in outer shell, it is more likely to lose those electrons • If there is 5, 6 or 7 electrons in outer shell, it’s more likely to gain electrons.

  5. Ions • Ions are atoms that have gained or lost electrons to have a full outer shell • Sodium loses one electron so it now has a positive charge. So we write it as Na+ (the plus is normally in the same place as a power in maths). • So, if you lose 3 electrons it will be 3+. • If you gain 3 electrons it will be 3-. • Read 26/27 and answer Q 4-9

  6. Ions • Atoms like to have full outer electron shells. As such, they tend to gain or lose electrons. • Atoms with 1,2 or 3 electrons in the outer shell (apart from Hydrogen) tend to lose electrons and become a positive ion (positive valency) as they have more protons than electrons. • Atoms with 5, 6 or 7 electrons in the outer shell tend to gain electrons and become a negative ion (negative valency) as they have less protons than neutrons.

  7. Ionic Bonds • When an anion (negative ion) and cation (positive ion) are close, they can bond or join together. • For example in Sodium (Na+) and Chlorine (Cl-), the Sodium will transfer one electron to Chlorine. • Both atoms are now stable and have bonded together.

  8. A Special Bond • The total charge in an ionic bond is normally 0 • 2 Chlorines (Cl-) can bond with one Magnesium (Mg 2+). • An ionic compound occurs when an anion and cation bond together. • When they bond together – think of them as little magnets. + and – want to go next to one another as 2 of the same charges repel.

  9. Naming anions in Ionic Equations • By itself, Chlorine is called Chlorine. • As a compound, it’s called Chloride. • Anions (atoms with more electrons than protons) change their name with ide on the end. • Examples are: • Oxygen = Oxide • Iodine - Iodide

  10. Questions • Complete Q 1-4 on Page 28/29 • Your Homework: Read A Closer Look at Gases (Page 230-231) and answer questions 1-5.

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