Ba2+ is the ion of the Ba atom. That means it has given away two electrons to other atoms in order to reach a stable state with 8 electrons in its outer shell.
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Ba is the chemical symbol for barium, while Ba 2+ refers to barium ion with a +2 charge. This means that Ba 2+ has lost two electrons, making it a positively charged ion.
The spectator ions in the reaction between BaCl2 and Na2SO4 are Na+ and Cl-. These ions do not participate in the reaction and remain in the solution unchanged.
Be(CN)2 Since Be occurs as Be2+, it takes 2 (CN)- ions.
Barium (Ba) will typically have a +2 charge as it is a group 2A element.
Ba(OH)2 is the chemical formula barium hydroxide.
In Ba(NO₃)₂, there are a total of 7 atoms - 1 barium (Ba), 2 nitrogen (N), and 6 oxygen (O) atoms.