calcium has 20 electrons.when it loses 2 electrons, it has 18 electrons.
Usually calcium loses 2 electrons, that's why calcium is found in Group 2 of the periodic table.
Two electrons are transferred between calcium and oxygen to form calcium oxide.
There are 8 electrons in the third energy level of a calcium atom.
Calcium atoms have 8 electrons in the second energy level. However, they are not the valence electrons. The outermost electrons in a calcium atom in the ground state are 2 4s electrons. So calcium atoms in the ground state have 2 valence electrons in the fourth energy level.
2
The neutral atom of calcium has 20 electrons; the cation Ca2+ has 18 electrons.
Calcium loses two electrons to form the cation Ca2+.
18 electrons.
This cation has 24 electrons.
19
21
5 in total
A Calcium ion with a -1 net charge would have 21 electrons. Calcium as a stable element has 20 electrons.
Magnesium cation has a 2+ charge (Mg2+). The meaning is two electrons minus.
Calcium normally has 20 electrons. Because it has a plus 2 charge, it must have two less electrons. Therefore, the calcium ion has 18 electrons.
Depends on how many electrons it gains. For every electron it gains, the atom becomes more negative. One electron gives it a -1 charge, 2 a -2 charge and so on
This formula is Ca(H2PO4)2. Since a dihydrogen phosphate anion has only one negative electric charge and a calcium cation has a positive charge of two, twice as many of the anions are required.