Chemical Elements and Properties

Chemical Elements Overview

• Essential Elements to Know:

  • Commonly used elements include metals, non-metals, and semi-metals.

• Atomic Number and Symbols:

  • Examples include:

  • Titanium (Ti) - Atomic Number 22

  • Chromium (Cr) - Atomic Number 24

  • Manganese (Mo) - Atomic Number 25

  • Nickel (Ni) - Atomic Number 28

  • Cobalt (Co) - Atomic Number 27

  • Copper (Cu) - Atomic Number 29

  • Zinc (Zn) - Atomic Number 30

  • Silver (Ag) - Atomic Number 47

  • Gold (Au) - Atomic Number 79

  • Platinum (Pt) - Atomic Number 78

  • Uranium (U) - Atomic Number 92

• States of Matter at Room Temperature:

  • Most metals are solid (e.g., Ti, Cr, Mo, Cu).

  • Notable exceptions include Mercury (Hg), which is liquid at room temperature.

  • Non-metals include Bromine (Br), which is a liquid, and gases like Krypton (Kr) and Xenon (Xe).

• Classification:

  • Metals: Solid, for example:

  • Barium (Ba) - Metal Solid

  • Platinum (Pt) - Metal Solid

  • Non-metals: Varied states (Gas or Liquid).

• Categories:

  • Metal-Solid, Metal-Liquid, Non-metal-Gas, and others depending on phase.