In the ion of barium, two electron are lost to follow the octet rule (to have a complete valence electron shell).
Usually three will be lost.
the answer is 28
Only three electrons.
Barium has 0 unpaired electrons. It has a full outer shell of electrons, which is why it is a stable element.
Barium's atomic number is 56. Thus, barium has 56 protons and 56 electrons. Its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2. So, barium has 2 electrons in its highest energy level, level 6.
Usually three will be lost.
Barium has 56 electrons.
the answer is 28
There is zero NET loss or gain of electrons
A barium atom has two valence electrons.
You can determine how many electrons are gained or lost by looking at the atom's charge. If the atom gains electrons, it becomes negatively charged; if it loses electrons, it becomes positively charged. The difference between the atom's original and final charge tells you how many electrons were gained or lost.
Only three electrons.
the oxidation number
A neutral barium atom has 56 electrons. This is because the atomic number of barium is 56, which corresponds to the number of electrons it has when it is electrically neutral.
Barium is monatomic so 56.
56
Barium has 0 unpaired electrons. It has a full outer shell of electrons, which is why it is a stable element.