Question

The most beautiful gem diamond is made of.. ............2nd question metal which is an important component of blood. 3rd metal which is liquid at room temperature and used in thermometers 4th First group of elements are soft.. .....

Answer 1

the 1st one is carbon
the second one is plasma
3rd one mercury

Answer 2

1. The most beautiful gem diamond is made of non metal --- CARBON--C

2. Metal which is an important component of blood is  ---- IRON --Fe

3. Metal which is liquid at room temperature and used in thermometer is--MERCURY --Hg.

4. First group elements are soft ,light weight and can  be cut by KNIFE.

Reason :First group elements are called as Alkali metals which are Lithium, sodium, Potassium,Rubidium,Caseium and Francium posses weak metallic bonding and hence they are soft.