Nota Intensif

nota intensif

Jadual berkala unsur / Periodic table

  Group 1

Going down the group , element more reactive BECAUSE

-atomic size increases

-forces between nucleus and valance electron become weaker

-easier to release electron

Reaction with 
 Water:    Na +  H₂O  -->  NaOH  + H₂

     Cl₂ gas:   2Li  +  Cl₂  -->  2LiCl

    O₂ gas:   4 Na  +  O₂ -->   2 Na₂O

  

Physical properties element group 1 

Boiling Point and Melting Point

decrease down the group.

              the size of the atoms increases, causing the distance of the atoms increases.

             (less energy is needed to overcome the force between atom)

Menuruni kumpulan,saiz atom bertambah. Jarak di antara  atom bertambah

 Daya tarikan antara nukleus atom  berkurang,semakin kurang tenaga haba diperlukan untuk engatasi daya tersebut