I believe it is 2, seeing it is a metal, and has 2 valence electrons. Correct me if I'm wrong, I don't have my Periodic Table with me (Calcium -> Ca?).
Calcium carbonate has 16 valence electrons. Calcium contributes 2 valence electrons, while each oxygen atom contributes 6 valence electrons.
One atom of calcium donates two electrons to one atom of oxygen during the formation of the compound CaO. Calcium loses two electrons to achieve a stable octet configuration, while oxygen gains two electrons to complete its outer shell.
There are 8 electrons in the third energy level of a calcium atom.
First, calcium oxide is an ionic compound and so does not form molecules. In one formula unit (ionic equivalent of a molecule) of calcium oxide there is 1 oxygen (8 protons) atom and 1 calcium atom (20 protons) for a total of 28.
Calcium would need to lose 2 electrons to have 8 valence electrons. This is because calcium has 2 valence electrons in its outer shell, and by losing these 2 electrons, it can achieve a stable octet configuration like the noble gas argon.
The neutral atom of calcium has 20 electrons; the cation Ca2+ has 18 electrons.
Calcium will lose two electrons to gain the noble gas configuration of Argon.
A calcium ion (Ca2+) loses two electrons from an atom to achieve a stable octet electron configuration. This results in a +2 charge on the calcium ion.
There are 20 electrons in a calcium atom.
Calcium has 20 electrons in the neutral atom.
Calcium oxide has 20 electrons from the calcium atom, and 8 electrons from the oxygen atom, totaling 28 electrons.
I am not sure what you mean by atoms, i think you mean electrons (part of an atom).Calcium is in Group 2 of the periodic table so this means that in order to become stable it will lose 2 electrons.
Calcium, as an element, has 20 electrons. But when becomes an ion, it loses two electrons, becoming Ca+2. Therefore, as an ion, calcium has only 18 electrons.18
Calcium is a metal element. There are 20 electrons in a single atom.
20 electronsIt has 20 protons and 20 neutrons.20 electrons
A calcium atom has 20 electrons, as it has 20 protons to maintain a neutral charge. A calcium ion, specifically Ca2+, has lost two electrons, so it has 18 electrons.
Calcium is a non metal element. There are 20 electrons in a single atom.