1. 0:56
0:55
0:54
0:53
0:57
0:58
1:02
1:01
1:00
0:59
0:52
0:51
0:44
0:43
0:42
0:41
0:45
0:46
0:50
0:49
0:48
0:47
1:03
1:04
1:19
1:18
1:17
1:16
1:20
1:21
1:25
1:24
1:23
1:22
1:15
1:14
1:08
1:07
1:06
1:05
1:09
1:10
1:13
1:12
1:11
0:40
0:39
0:09
0:08
0:07
0:06
0:10
0:11
0:15
0:14
0:13
0:12
0:05
0:04
0:00
0:00
0:00
0:00
0:00
0:00
0:03
0:02
0:01
0:00
0:16
0:17
0:32
0:31
0:30
0:29
0:33
0:34
0:38
0:37
0:36
0:35
0:28
0:27
0:21
0:20
0:19
0:18
0:22
0:23
0:26
0:25
0:24
3:00
1:26
2:30
2:29
2:28
2:27
2:31
2:32
2:36
2:35
2:34
2:33
2:26
2:25
2:18
2:17
2:16
2:15
2:19
2:20
2:24
2:23
2:22
2:21
2:37
2:38
2:53
2:52
2:51
2:50
2:54
2:55
2:59
2:58
2:57
2:56
2:49
2:48
2:42
2:41
2:40
2:39
2:43
2:44
2:47
2:46
2:45
1:27
2:14
1:43
1:42
1:41
1:40
1:44
1:45
1:49
1:48
1:47
1:46
1:39
1:38
1:31
1:30
1:29
1:28
1:32
1:33
1:37
1:36
1:35
1:34
2:13
1:50
2:06
2:05
2:04
2:03
2:07
2:08
2:12
2:11
2:10
2:09
1:51
2:02
1:55
1:54
1:53
1:52
2:01
1:56
2:00
1:57
1:59
1:58
Do Now
Which atom is larger and why:
Na or Mg
Which atom has a higher Electronegativity and why:
Na or Fr
Na or Cl

2. Properties of Groups

3. Groups of elements Group I – alkali metals
Forms a “base” when reacting with water
Group 2 – alkaline earth metals
Also form bases with water; do not dissolve well, hence “earth metals”
Group 17 – halogens
Means “salt-forming”

4. Electron Configurations in Groups
Elements are sorted into different groups based on their electron configurations:
Noble gases
Representative elements
Transition metals
Inner transition metals

5. Electron Configurations in Groups
Noble gases
Group 18
A.K.A. “inert gases” because they rarely take part in a reaction
full outer shell of 8 electrons (except He which has 2 electrons)

6. Electron Configurations in Groups
Representative Elements
Groups 1,2 and 13-17
Display wide range of properties, a good “representative”
Consist of metals, nonmetals, and metalloids
Some are solid, liquid or gas at STP
They do not have a full valence shell

7. Electron Configurations in Groups
Transition metals
groups
A “transition” between the metal area and the nonmetal area
Examples are gold, copper, silver

8. Electron Configurations in Groups
Inner Transition Metals
located below the main body of the table, in two horizontal rows
Formerly called “rare-earth” metals

9. Elements in the 1,2,13-17 groups are called the representative elements18 2 13 14 15 16 17

10. The group 3-12 are called the transition metals
These are called the inner transition metals, and they belong here

11. Group 1 are the alkali metals (not Hydrogen)
Group 2 are the alkaline earth metals H

12. Group 18 are the noble gases
Group 17 is called the halogens

13. H 1 Li 3 Na 11 K 19 Rb 37 Cs 55 Fr 87 1
2-1
2-8-1
Do you notice any similarity in these configurations of the alkali metals?

14. Do you notice any similarity in the configurations of the noble gases?2
2-8
2-8-8 He
Do you notice any similarity in the configurations of the noble gases? 2 Ne 10 Ar 18 Kr 36 Xe 54 Rn 86