Zirconium



__Element symbol:__ **Zr**

__Group Number:__ **4**

__Period:__ **5**

__Name of the person who discovered it and year:__ **Martin Heinrich Klaproth, a german chemist in 1789.**

__The element at room temperature__: **Solid**

__Colour of element:__ **Silvery White**

__The atomic number:__ **40**

__Atomic mass:__ **91.224**

__Number of the protons, neutrons and electrons:__ **51.22**

__Boiling point:__ **4409°c **

__Melting Point:__ **1855°c **

__Type:__ **Metal**

__What is Zirconium used for?__
 * **Lamp Filaments**
 * **Vaccum Tubes**
 * **Surgical Appliances**
 * **Photo Flash Bulbs**
 * **Nuclear Energy Appliances**