Four Elements

Iodine (I)

• Atomic Number: 53
• Mass Number: 126.9
• Nonmetal
• Part of Halogens
• Electron Configuration: [Kr]4d¹⁰ 5s² 5p⁵
  
• Solid


• Color: violet-dark gray, lustrous


• http://www.newworldencyclopedia.org/entry/Iodine


• Atomic Mass: 126.90447

Krypton (Kr)

• Atomic Number: 53
• Mass Number: 83.8
• Nonmetal
• Part of Noble Gases
• [Ar] 3d¹⁰ 4s² 4p⁶
• Atomic Mass: 83.798
• Gas
• Color: colorless
• http://www.newworldencyclopedia.org/entry/Krypton

Selenium (Se)

• Atomic Number: 34
• Mass Number: 79.0
• Nonmetal
• [Ar] 3d¹⁰ 4s² 4p⁴
• Atomic Mass: 78.96
• Solid
• Color: gray-black, metallic luster
• http://www.newworldencyclopedia.org/entry/Selenium

Germanium (Ge)

• Atomic Number: 32
• Mass Number: 72.6
• Metalloid
• [Ar] 3d¹⁰ 4s² 4p²
• Atomic Mass
• Solid
• Color: grayish white
• http://www.newworldencyclopedia.org/entry/Germanium