Ba
Barium
Alkaline EarthAtomic Number: 56 • Atomic Mass: 137.3300 u • Period: 6 • Group: 2
Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²
Phase: Solid
Electronegativity: 0.89
Atomic Structure
Electron Configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²The electron configuration represents the distribution of electrons in atomic orbitals, showing how they are arranged in energy levels and subshells.
Subatomic Particles
Protons
56
Positive charge
Neutrons
81
No charge
Electrons
56
Negative charge
Atomic Number & Mass Number
The atomic number (56) represents the number of protons in the nucleus.
The mass number (137) is the sum of protons and neutrons in the nucleus.
Isotopes
Isotopes are variants of an element that have the same number of protons but different numbers of neutrons.
Ba-130
Ba-132
Ba-134
Ba-135
Ba-136
Ba-137
Ba-138
Stability & Half-Life
Half-Life Information
Stable
Half-life is the time required for half of the atoms of a radioactive isotope to decay.
Periodic Table Location
Period: 6
Group: 2
Category: Alkaline Earth
The period indicates the main energy level, while the group suggests similar chemical properties.