Uploaded on

 

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
129
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
3
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Atoms and IonsSNC 2D1
  • 2. Is drinking too much water badfor you?? Drinking too much water cancause hyponatremia◦ Symptoms: disorientation andloss of balance Excess water can dilute theconcentration of sodium in theblood to dangerously lowlevels (with risk of death ifuntreated)
  • 3. What?Sodium in the blood??
  • 4. No! of course not.. We are referring to sodium ions Many ions are necessary for ourhealthExample:◦ Calcium, phosphorus  components ofbone◦ Iron  help carry oxygen around body inblood
  • 5. Atoms vs. Ions Atoms are electrically NEUTRALparticles with equal numbers of e- andp+ An ion is an atom that has becomeCHARGED by either gaining orlosing electrons in its valence shell
  • 6. Sodium Atom vs. Sodium Ion Sodium atoms LOSE one e-when they react with otheratoms Then, each sodium ioncontains 11 p+ and only 10 e- Result: sodium ions have anionic charge of +1 (a.k.a. Na1+or Na+)Na containsONE electron init’s outer orbit.Remember…STABLE orbitscontain 8electrons!! Sowhat does thismean?
  • 7. Fluorine Atom vs. Fluoride Ion Fluorine atoms GAIN oneelectrons when they react withother atoms Therefore, each fluoride ioncontains 9 p+ and 10 e- Result: fluoride ions have anionic charge of -1 (a.k.a. F1- or F-)F-9 contains 7electrons in itsouter orbitRemember…STABLEorbits contain8 electrons!! Sowhat does thismean?
  • 8. Ions vs. Noble Gases Ions are STABLE Noble Gases are alsoSTABLE Because they havefilled valence shells… Which noble gas hasthe same # of e- asNa+? Which noble gas hasthe same # of e- as F-? We say Na+ and F- isisoelectronic to Ne
  • 9. DID YOU KNOW? Fluoride ions help make tooth enamel strong Fluoride is found in our tap water For decades, Canadians have been gettingfewer dental cavities
  • 10. Try This!!1)Draw the B-R diagram for anAluminum atom2)Draw the B-R diagram for anAluminum ion3)Write the new symbol for theAluminum ion4)What is the Aluminum ionisoelectronic with? (i.e. whatelement has the same # ofelectrons as the aluminum ion?
  • 11. Aluminum ion Al:13p+, 13n0, 13e- Draw the Bohr-Rutherforddiagram: 3 valence e- How to reachstability? Gain 5 or lose 3 e-?What is Al3+ isoelectronic with?Neon!
  • 12. Try This!!1)Draw the B-R diagramfor a Sulfur atom2)Draw the B-R diagramfor a Sulfide ion3)Write the new symbolfor the Sulfide ion4)What is the sulfide ionisoelectronic with?(i.e. what element hasthe same # ofelectrons as the
  • 13. Sulfide ionS: 16p+, 16n0, 16e- Draw the Bohr-Rutherford diagram: 6 valence e- How to reachstability? Gain 2 or lose 6 e-?What is S2- isoelectronic with?Argon!
  • 14. Hydrogen Unusual element Can form +ve and –ve ions Achieves stability by gaining one e- tofill its orbit (H-) or loses its only e- (H+)
  • 15. Naming Ions Cations: positive charges Same name as the element and addthe word “ion” E.g. Sodium  Sodium ion Anions: negative charges Add “-ide” to the stem of the name E.g. Oxygen  oxide ion E.g. Phosphorus  phosphide ions