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The Why and How of Ions Featuring the Return of Bohr-Rutherford Diagrams and the Periodic Table.

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Presentation on theme: "The Why and How of Ions Featuring the Return of Bohr-Rutherford Diagrams and the Periodic Table."— Presentation transcript:

1 The Why and How of Ions Featuring the Return of Bohr-Rutherford Diagrams and the Periodic Table

2 Bohr-Rutherford Diagrams Bohr-Rutherford diagrams (or simply Bohr diagrams) are used to show the arrangement of electrons in the atom, e.g.:

3 How To Draw Bohr Diagrams 1)Find your element on the periodic table. 2)Determine the number of electrons, which for a neutral atom is equal to the number of ?

4 How To Draw Bohr Diagrams 1)Find your element on the periodic table. 2)Determine the number of electrons, which for a neutral atom is equal to the number of protons, which is equal to the ?

5 How To Draw Bohr Diagrams 1)Find your element on the periodic table. 2)Determine the number of electrons, which for a neutral atom is equal to the number of protons, which is equal to the atomic number.

6 How To Draw Bohr Diagrams 3)Determine which period (row) your element is in. Elements in the 1 st period have one energy level or shell. Elements in the 2 nd period have two, and so on.

7 How To Draw Bohr Diagrams C C 4) Draw a nucleus with the element symbol (and optionally, the #s of protons and neutrons) inside. 5) Draw the shells around the nucleus. Carbon is in the 2 nd period, so it has two energy levels or shells.

8 How To Draw Bohr Diagrams 6) Add the electrons. Carbon has 6 electrons. The first shell can only hold ? C C

9 How To Draw Bohr Diagrams 6) Add the electrons. Carbon has 6 electrons. The first shell can only hold 2 electrons. C C

10 How To Draw Bohr Diagrams You need to add 4 more so these go in the 2 nd shell. The 2 nd shell can hold up to ? C C

11 How To Draw Bohr Diagrams You need to add 4 more so these go in the 2 nd shell. The 2 nd shell can hold up to 8 electrons; the 3 rd shell can hold 18, but the elements in the first few periods only use 8 electrons. C C

12 How To Draw Bohr Diagrams 7) Check your work: Count your electrons per shell and your total electrons! C C

13 Bohr Diagrams: Practice Try drawing Bohr diagram for each of the following elements on your own: a)H b)He c)O d)Al e)Ne f)K C C

14 Bohr Diagrams: Practice Try drawing Bohr diagram for each of the following elements on your own: a)H – 1 electron b)He c)O d)Al e)Ne f)K H H

15 Bohr Diagrams: Practice Try drawing Bohr diagram for each of the following elements on your own: a)H b)He - 2 electrons c)O d)Al e)Ne f)K HeHe HeHe

16 Bohr Diagrams: Practice Try drawing Bohr diagram for each of the following elements on your own: a)H b)He c)O - 8 electrons d)Al e)Ne f)K O O

17 Bohr Diagrams: Practice Try drawing Bohr diagram for each of the following elements on your own: a)H b)He c)O d)Al - 13 electrons e)Ne f)K Al

18 Bohr Diagrams: Practice Try drawing Bohr diagram for each of the following elements on your own: a)H b)He c)O d)Al e)Ne - 10 electrons f)K NeNe NeNe

19 Bohr Diagrams: Practice Try drawing Bohr diagram for each of the following elements on your own: a)H b)He c)O d)Al e)Ne f)K - 19 electrons K K

20 Lewis Dot Diagrams The electrons in the outermost shell are called ?

21 Lewis Dot Diagrams The electrons in the outermost shell are called valence electrons.

22 Lewis Dot Diagrams The electrons in the outermost shell are called valence electrons. Lewis Dot Diagrams are abbreviated Bohr Diagrams that show just these outermost electrons, e.g.:

23 Valence Electrons and Families Note that both hydrogen (H) and potassium (K) have just ? electron in their outermost shell. Note also that these elements are both found in the ? column of the periodic table. This is not a coincidence!

24 Valence Electrons and Families Note that both hydrogen (H) and potassium (K) have just 1 electron in their outermost shell. Note also that these elements are both found in the ? column of the periodic table. This is not a coincidence!

25 Valence Electrons and Groups Note that both hydrogen (H) and potassium (K) have just 1 electron in their outermost shell. Note also that these elements are both found in the 1 st column of the periodic table. This is not a coincidence!

26 Valence Electrons and Groups All elements in the same group (column) have the same number of electrons in their outermost shell (ref. p. 150). It is these electrons that determine the behavior of the element, including how it reacts with other elements – and how it forms ions.

27 Valence Electrons and Groups Lets look at these groups or families in more detail....

28 ALKALI METALS 1 valence electron (Hydrogen is not officially a member) Soft and silvery metals Very reactive, esp. with water

29 ALKALINE EARTH METALS 2 valence electrons White and malleable Reactive, but less so

30 TRANSITION METALS (the Groups in the middle)

31 BORON FAMILY 3 valence electrons Most are metals Boron is a metalloid.

32 CARBON FAMILY 4 valence electrons Contains metals, metalloids, and a non-metal: carbon (C)

33 NITROGEN FAMILY 5 valence electrons Contains metals, metalloids, and non-metals

34 OXYGEN FAMILY 6 valence electrons Mostly non- metals Reactive

35 Halogens 7 valence electrons All are non- metals Very reactive

36 Noble Gases Full outer shell Exist as gases Not reactive with other elements Do not form ions.

37 The Why of Ions The Noble Gases do not react and do not form ions because they already have what all atoms want: full outer shells.

38 The How of Ions Atoms will either gain electrons to fill their outer shell (as in the case of the non-metal chlorine)

39 The How of Ions or lose electrons to go down to their last full shell (as in the case of the metal sodium)

40 Tune in next time.... More details on the formation of ions will be revealed tomorrow. For now, answer the questions: p. 148 #1-5 p. 150 #1-3 p. 153 #10, 11


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