Explain the various periodic trends in the alkali metals down the group

Explanation

In alkali metals, as we move down the group
(i) reactivity increases
(ii) atomic radii i increases
(iii) screening effect increases
(iv) tendency to form  cation by loosing outer electron increases
(v) melting point and boiling tendency nd boiling point decreases
  ionization enthalpy decreases and
(vii) density increases