What is the electron configuration of barium?

The electron configuration of barium (atomic number 56) can be written three different ways:

- Full configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2

- Compressed (without all standard script numbers): 1s2 2s2p6 3s2p6d10 4s2p6d10 5s2p6 6s2

- Noble Gas form : [Xe] 6s2 (this works because [Xe] symbolizes the electronic configuration of Xenon, which is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6. When added to 6s2, it is equivalent to the full electron configuration of Barium, when neutral.)
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What is the electron configuration of radium?

The element radium (atomic number 88) has the long term electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p64f14 5d10 6s2 6p6 7s2 The electron configuration ( (MORE)

How many electrons does barium have to give up to achieve noble-gas configuration?

Barium is in group 2, so it has 2 valence electrons. Hence, barium has to release two electrons to achieve the noble-gas configuration.
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