1) The most common element in the universe
Hydrogen
2) The most common element on the earth’s crust
Aluminium
3) The most abundant metal element present in our body
Calcium
4) The element common to all acids
Hydrogen
5) The densest element
Osmium
6) The lightest element
Hydrogen
7) The hardest metal
Chromium
8) The radio active gaseous element
Francium
9) Most electropositive element is
Francium
10) The heaviest known hallide is
Halogen Astatine
11) The element which shows highest electron affinity is
Chlorine
12) The most common element present in earth’s crust
Oxygen
13) The most chemically active element
Fluorine
14) The 99th element named in honour of Albert Einstein is
Einsteinium
15) The 101st element named in honour of Mendeleev is
Mendelevium