Question

The atomic number of barium is 56.

what do you know about the subatomic particles in an atom of this element ?

Answer 1

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