Periodic Table

• Arranged by increasing proton number

Groups: 

• Vertical groups

• Numbered I - VII, 0

• Have the same:

  • • Valence electrons (Same as group number)

    • Chemical properties

    • Chemical reactions

    • Charge of ion

• Types:

  • • I: Alkali metals

    • II: Alkali earth metals

    • VII: Halogens

    • 0: Noble gases

    • II - III: Transition metals

Periods:

• Horizontal groups

• Have same no. of shells fully or partially occupied with electron(s)

• Shifts from metal to non-metal 

Metalloids

• High melting point

• High boiling point

• High density

• Semiconductor

• Forms 4 covalent bonds

Transition metals:

• High electricity conductivity

• Malleable

• High density

• High melting, boiling points