CO32- ions consist of one C and three O atoms with two extra electrons, counting for the ion charge (2-).
Total in carbonate ions (CO32-) : 30 protons (p+) and 32 electrons (e-)
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A Co3+ ion has 27 protons and 24 electrons. The charge of the ion indicates that it has lost 3 electrons, leaving it with 24.
A Co3+ ion has lost three electrons from its neutral state, so it has 23 electrons.
There are a total of 22 electrons in the CO3 2- ion. This consists of 6 electrons from carbon (C) and 8 electrons from each of the three oxygen (O) atoms, along with the additional 2 electrons to account for the overall 2- charge of the ion.
Ionic compound with ionic bond between K+ ions and CO32- ions.
Cs2CO3 is ionic. The compound is composed of Cs+ ions and CO32- ions that are held together by ionic bonds due to the transfer of electrons from Cs to CO3.
The neutral atom of cobalt has 27 electrons. The number can vary up or down depending on the chemistry of the sample of cobalt. A link is provided to the Wikipedia article on the element cobalt.