2
There are 2 valence electrons in Barium.
Barium has two valence electrons, as can be deduced from its placement in Group 2 of the modern periodic table.
Barium (Ba) has 2 valence electrons in its outer shell. Therefore, it does not have any 5p electrons.
Valence electrons are electrons that are on the outside "shell." In Group (column) 1, there is only one valence electrons for each element. In Group (column) 2, there are two valence electrons. Group 13: 3 valence electrons Group 14: 4 valence electrons Group 15: 5 valence electrons Group 16: 6 valence electrons Group 17: 7 valence electrons Group 18: 8 valence electrons There is no Group 19, so this list is done. For the metals, each element will need to be mapped out utilizing the Bohr Diagram design or something of the like as valence electrons are difficult to define due to the grouping on the periodic table. The most valence electrons that can be in an outer shell is eight. Barium (Ba) is in Group (column) 2, and thus has only two valence electrons.
Examples: Ca, Mg, Ba, Sr, Ra, etc.
Barium (Ba) is located in Group 2 of the periodic table, which is known as the alkaline earth metals. It has two valence electrons in its outermost shell. These valence electrons are responsible for Barium's chemical properties and its tendency to form compounds.
Any neutral atom of barium contains 56 electrons, the counter charge for the 56 protons contained in the nucleus of a barium atom, as indicated by its atomic number, 56.
Ba is a group 2 elements with 2 valence electrons. S is a group 16 element (or oxygen family) and has 6 valence electrons. Ba gives 2 of it's valence electrons to S giving both atoms an octet. They combine in an ionic compound in 1:1 proportions. The formula is BaS and it's called barium sulphate
Barium (Ba) has an atomic number of 56, which means it has 56 electrons in a neutral atom. The "2" you mentioned likely refers to the charge on the barium ion (Ba2+), which means it has lost two electrons, resulting in 54 electrons in the Ba2+ ion.
Any element in the 2A column of the periodic chart: Be, Mg, Ca, Sr, Ba, and Ra.
The alkaline earth group has two valence electrons.
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.