1. Periodic Table Madison Maxwell http://www.chemicool.com/elements/helium.html

2. H - Hydrogen become metallic at very high pressures. Colorcolorless Atomic weight1.0079 Stategas Melting point-259.14 o C, 14.01 K Boiling point-252.87 o C, 20.28 K Electrons:1 Protons:1 Neutrons in most abundant isotope:0 Electron shells1 Electron configuration1s 1 Density @ 20 o C0.0000899 g/cm 3

3. Ar- Argon Argon is a noble gas and a nonmetal Color:colorless Atomic weight:39.948 State:gas Melting point:-189.3 o C, 83.85 K Boiling point:-185.8 o C, 87.3 K Electrons:18 Protons:18 Neutrons in most abundant isotope:22 Electron shells:2,8,8 Electron configuration:1s 2 2s 2 2p 6 3s 2 3p 6 Density @ 20 o C:0.001784 g/cm 3

4. Br- Bromine Bromine is a halogen and a nonmetal Color:red-brown Atomic weight:79.904 State:liquid Melting point:-7 o C, 277 K Boiling point:58.9 o C, 332 K Electrons:35 Protons:35 Neutrons in most abundant isotope:44 Electron shells:2,8,18,7 Electron configuration:[Ar] 3d 10 4s 2 4p 5 Density @ 20 o C:3.122 g/cm 3

5. Ca- Calcium Calcium is an alkali earth metal Color:silvery-gray Atomic weight:40.078 State:solid Melting point:842 o C, 1115 K Boiling point:1484 o C, 1771 K Electrons:20 Protons:20 Neutrons in most abundant isotope:20 Electron shells:2,8,8,2 Electron configuration:1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 Density @ 20 o C:1.55 g/cm 3

6. Cu- Copper Copper is a transition metal Color:orange-red Atomic weight:63.546 State:solid Melting point:1084.62 o C, 1357.77 K Boiling point:2560 o C, 2833 K Electrons:29 Protons:29 Neutrons in most abundant isotope:34 Electron shells:2,8,18,1 Electron configuration:[Ar] 3d 10 4s 1 Density @ 20 o C:8.96 g/cm 3

7. Db- Dubnium Dubnium is a transition metal Color: Atomic weight:268, no stable isotopes State:solid (presumed) Melting point: Boiling point: Electrons:105 Protons:105 Neutrons in most abundant isotope:163 Electron shells:2,8,18,32,32,11,2 Electron configuration:[Rn] 5f 14 6d 3 7s 2 Density @ 20 o C:

8. Au- Gold Gold is a transition metal Color:golden yellow Atomic weight:196.9665 State:solid Melting point:1064.18 o C, 1337.33 K Boiling point:2850 o C, 3123 K Electrons:79 Protons:79 Neutrons in most abundant isotope:118 Electron shells:2,8,18,32,18,1 Electron configuration:[Xe] 4f 14 5d 10 6s 1 Density @ 20 o C:19.32 g/cm 3

9. F- Fluorine Fluorine is a halogen and a nonmetal Color:pale yellow Atomic weight:18.998403 State:gas Melting point:-219.6 o C, 53.6 K Boiling point:-188.1 o C, 85.1 K Electrons:9 Protons:9 Neutrons in most abundant isotope:10 Electron shells:2,7 Electron configuration:1s 2 2s 2 2p 5 Density @ 20 o C:0.001696 g/cm 3

10. He- Helium Helium is a noble gas and a nonmetal Color:colorless Atomic weight:4.00260 State:gas Melting point:-272.2 o C, 0.95 K Note: At normal atmospheric pressure, helium does not solidify and so has no melting point. The melting point quoted above is under a pressure of 25 atmospheres. Boiling point:-268.9 o C, 4.2 K Electrons:2 Protons:2 Neutrons in most abundant isotope:2 Electron shells:2 Electron configuration:1s 2 Density @ 20 o C:0.0001787 g/cm 3

11. Fe- Iron Iron is a transition metal Color:silvery-gray Atomic weight:55.847 State:solid Melting point:1535.1 o C, 1808.2 K Boiling point:2750 o C, 3023 K Electrons:26 Protons:26 Neutrons in most abundant isotope:30 Electron shells:2,8,14,2 Electron configuration:[Ar] 3d 6 4s 2 Density @ 20 o C:7.87 g/cm 3

12. Pb- Lead Lead is an ‘other metal’ Color:bluish gray Atomic weight:207.2 State:solid Melting point:327.46 o C, 600.61 K Boiling point:1750 o C, 2023 K Electrons:82 Protons:82 Neutrons in most abundant isotope:126 Electron shells:2,8,18,32,18,4 Electron configuration:[Xe] 4f 14 5d 10 6s 2 6p 2 Density @ 20 o C:11.34 g/cm 3

13. Kr - Krypton Krypton is a noble gas and a nonmetal Color:colorless Atomic weight:83.80 State:gas Melting point:-157.3 o C, 115.9 K Boiling point:-153.2 o C, 119.4 K Electrons:36 Protons:36 Neutrons in most abundant isotope:48 Electron shells:2,8,18,8 Electron configuration:[Ar] 3d 10 4s 2 4p 6 Density @ 20 o C:0.003708 g/cm 3

14. Mg- Magnesium Magnesium is an alkali earth metal Color:silvery-white Atomic weight:24.305 State:solid Melting point:650 o C, 923 K Boiling point:1090 o C, 1363 K Electrons:12 Protons:12 Neutrons in most abundant isotope:12 Electron shells:2,8,2 Electron configuration:1s 2 2s 2 2p 6 3s 2 Density @ 20 o C:1.738 g/cm 3

15. Ne- Neon Neon is a noble gas and a nonmetal Color:colorless Atomic weight:20.180 State:gas Melting point:-248.57 o C, 24.53 K Boiling point:-246.0 o C, 27.1 K Electrons:10 Protons:10 Neutrons in most abundant isotope:10 Electron shells:2,8 Electron configuration:1s 2 2s 2 2p 6 Density @ 20 o C:0.0009 g/cm 3

16. O- Oxygen Oxygen is a chalcogen and a nonmetal Color:colorless Atomic weight:15.9994 State:gas Melting point:-218.3 o C, 54.8 K Boiling point:-182.9 o C, 90.2 K Electrons:8 Protons:8 Neutrons in most abundant isotope:8 Electron shells:2,6 Electron configuration:1s 2 2s 2 2p 4 Density @ 20 o C:0.001429 g/cm 3

17. Ni- Nickel Nickel is a transition metal Color:silvery-white Atomic weight:58.693 State:solid Melting point:1455 o C, 1728 K Boiling point:2990 o C, 3263 K Electrons:28 Protons:28 Neutrons in most abundant isotope:30 Electron shells:2,8,16,2 Electron configuration:[Ar] 3d 8 4s 2 Density @ 20 o C:8.91 g/cm 3

18. Pt- Platinum Platinum is a transition metal Color:silvery-white Atomic weight:195.08 State:solid Melting point:1768 o C, 2041 K Boiling point:3820 o C, 4093 K Electrons:78 Protons:78 Neutrons in most abundant isotope:117 Electron shells:2, 8, 18, 32, 17, 1 Electron configuration:[Xe] 4f 14 5d 9 6s 1 Density @ 20 o C:21.45 g/cm 3

19. K- Potassium Potassium is an alkali metal Color:silvery-white Atomic weight:39.0983 State:solid Melting point:63.4 o C, 336.5 K Boiling point:765.6 o C, 1038.7 K Electrons:19 Protons:19 Neutrons in most abundant isotope:20 Electron shells:2,8,8,1 Electron configuration:1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 Density @ 20 o C:0.862 g/cm 3

20. Ra- Radium Radium is an alkali earth metal Color:silvery white Atomic weight:(226), no stable isotopes State:solid Melting point:700 o C, 973 K Boiling point:1500 o C, 1773 K Electrons:88 Protons:88 Neutrons in most abundant isotope:138 Electron shells:2,8,18,32,18,8,2 Electron configuration:[Rn] 7s 2 Density @ 20 o C:5.5 g/cm 3

21. Rn- Radon Radon is a noble gas and a nonmetal Color:colorless Atomic weight:(222), no stable isotopes State:gas Melting point:-71 o C, 202 K Boiling point:-62 o C, 211 K Electrons:86 Protons:86 Neutrons in most abundant isotope:136 Electron shells:2,8,18,32,18,8 Electron configuration:[Xe] 4f 14 5d 10 6s 2 6p 6 Density @ 20 o C:0.00973 g/cm 3

22. Ag- Silver Silver is a transition metal Color:silver Atomic weight:107.868 State:solid Melting point:961.95 o C, 1235.1 K Boiling point:2155 o C, 2428 K Electrons:47 Protons:47 Neutrons in most abundant isotope:60 Electron shells:2,8,18,18,1 Electron configuration:[Kr] 4d 10 5s 1 Density @ 20 o C:10.5 g/cm

23. Na- Sodium Classification:Sodium is an alkali metal Color:silvery-white Atomic weight:22.98977 State:solid Melting point:97.72 o C, 370.87 K Boiling point:883 o C, 1156 K Electrons:11 Protons:11 Neutrons in most abundant isotope:12 Electron shells:2,8,1 Electron configuration:1s 2 2s 2 2p 6 3s 1 Density @ 20 o C:0.971 g/cm 3

24. Ta- Tantalum Classification:Tantalum is a transition metal Color:gray Atomic weight:180.947 State:solid Melting point:3020 o C, 3293 K Boiling point:5560 o C, 5833 K Electrons:73 Protons:73 Neutrons in most abundant isotope:108 Shells:2,8,18,32,11,2 Electron configuration:[Xe] 4f 14 5d 3 6s 2 Density @ 20 o C:16.6 g/cm 3

25. Zn- Zinc Classification:Zinc is a transition metal Color:bluish silver Atomic weight:65.41 State:solid Melting point:419.53 o C, 692.68 K Boiling point:910 o C, 1183 K Electrons:30 Protons:30 Neutrons in most abundant isotope:34 Electron shells:2,8,18,2 Electron configuration:[Ar] 3d 10 4s 2 Density @ 20 o C:7.14 g/cm 3