1. Homework # 7 HW # 7: Atoms VS Ions Castle Learning:
Time 30 questions/35 minutes (TEST)
Due date: 11/5/16
TEST: 11/6/16

2. Aim #7 : How do you draw a Lewis Structure (Electron Dot Diagram) for an element?

3. Q. How do you write the chemical symbols for an element?
Q . What is a valence electron?
Q. Use the periodic table and tell me where are located the metals/ nonmetals?

4. Q. Which is the first element in group # 1?Li
Q. What is the name for group # 2?
Q. What is the name for group # 17?
Q. What is the name for group # 18?

5. Noble Gases (now) Why: Kr and Xe Group 1: alkali
Group 2: Alkaline Earth Metals
Group 17: Halogens
Group 18: Inert gases (before)
Noble Gases (now)
Why:
Kr and Xe

6. Q. How many valence electrons does sodium atom have?
Q. How many valence electrons does fluorine atom have?
Q. How many valence electrons do noble gases have?

8. 1. What is an ion?
Metals tend to lose electrons and become positively ions called cations.
Example: Na+
Nonmetals tend to gain electrons and become negatively ions called anions.
Example: Cl-

9. Atoms VS Ions Sodium atom Sodium Ion
11Na P = +11 E = Charge of the atom: zero!
11Na+
P = +11
E = - 10 +1
Charge of the ion: +1

10. Na+
2-8
P = +11
E = - 10 +1
Charge of the ion: +1
Noble Gases

11. Atoms VS Ions Cl- Cl Chlorine atom Chloride Ion P = +17 E = - 17
Charge of the atom: zero!
Cl-
P = +17
E = - 18 -1
Charge of the ion: -1

12. Cl-
2-8-8
P = +17
E = - 18 -1
Charge of the ion: -1
Noble Gases

13. Names of Anions Atom Anion Hydrogen Hydride Nitrogen Nitride Oxygen
Oxide
Fluorine
Fluoride
Chlorine
Chloride
Bromine
Bromide
Iodine
Iodide
Sulfur
Sulfide
Phosphorus
Phosphide

14. How can you define a valence electron?

15. 2. Valence Electron 2-8-1 Valence electron: 1
Electrons in the outer shell
Example:
11Na
2-8-1
Valence electron: 1

16. S
2-8-6

17. How do we find sodium in nature? Why?
Na is found in nature as a compound because is very active!

18. How do we find Fluorine in nature?
F is found in nature as a compound because is very active!

19. 3. Lewis Electron Dot Diagrams
Notation that draws the outer electrons around the symbol of an element.
*X: represent the element!

20. Why are the valence electrons very important?
Outer-shell electrons determine the reactivity and properties of an atom.

21. 4. Steps to draw electron dot diagrams
1. Write the symbol of the element: Na 2. Write the e- configuration.: Select electrons in the outer shell: 1 4. Imagine the symbol being in a box. 5. Place a dot around the symbol for each electron in the outer shell. . Na . Na

22. Lewis Electron Dot

23. Group 1:

24. Group 2

25. Group 13

26. Group 14

27. Group 15

28. Group 16

29. Group 17

30. Group 18

31. Lewis Electron Dot (RB Page 88)

32. Draw the Lewis dots for the following atoms:Si Ne Cl Na O H N P

33. 5. Atomic Radius VS Ionic Radius

34. Metal
Ion: Na+
Atom: Na
2-8
2-8- 1

35. Nonmetals
Ion: Cl -
Atom: Cl
2-8-7
2-8-8

36. Can you define an ionic bond?

37. END OF THE SHOW!

38. Regents Question: 06/02 #3 Which compound contains ionic bonds? NO NO2
CaO
(4) CO2
Nitrogen – nonmetal
Oxygen – nonmetal
Calcium – metal
Carbon – nonmetal

39. Regents Question: 08/02 #11
Which formula represents an ionic compound?
(1) NaCl
(2) N2O
(3) HCl
(4 )H2O

40. Regents Question: 06/02 #12
Which species does not have a noble gas electron configuration?
Na +
(2) Mg 2+
(3) A r
(4) S

41. Regents Question: 08/02 #23
Which electron configuration is correct for a sodium ion?
2–7
(2) 2–8
(3) 2–8–1
(4) 2–8–2

42. Regents Question: 08/02 #23
Which electron configuration is correct for a sodium ion?
2–7
(2) 2–8
(3) 2–8–1
(4) 2–8–2

43. Regents Question: 06/03 #11
What is represented by the dots in a Lewis electron-dot diagram of an atom of an element in Period 2 of the Periodic Table?
(1) the number of neutrons in the atom
(2) the number of protons in the atom
(3) the number of valence electrons in the atom
(4) the total number of electrons in the atom