The atomic number of barium is 56.
what do you know about the subatomic particles in an atom of this element ?

Basic Information
Name: Barium 
Symbol: Ba 
Atomic Number: 56 
Atomic Mass: 137.327 amu 
Melting Point: 725.0 °C (998.15 K, 1337.0 °F) 
Boiling Point: 1140.0 °C (1413.15 K, 2084.0 °F) 
Number of Protons/Electrons: 56 
Number of Neutrons: 81 
Classification: Alkaline Earth 
Crystal Structure: Cubic 
Density @ 293 K: 3.51 g/cm3 
Color: Silver

Atomic Structure 
Number of Energy Levels: 6
First Energy Level: 2 
Second Energy Level: 8 
Third Energy Level: 18 
Fourth Energy Level: 18 
Fifth Energy Level: 8 
Sixth Energy Level: 2
IsotopesIsotopeHalf LifeBa-130StableBa-13111.7 daysBa-132StableBa-13310.5 yearsBa-133m1.6 daysBa-134StableBa-135StableBa-135m1.2 daysBa-136StableBa-137StableBa-137m2.6 minutesBa-138StableBa-1391.4 hoursBa-14012.8 daysBa-14118.3 minutesBa-14210.7 minutes
Facts
Date of Discovery: 1808 
Discoverer: Sir Humphrey Davy 
Name Origin: From the Greek word barys (heavy) 
Uses: Medical applications, among others 
Obtained From: barytine, whiterite 

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Rn in the right answer