What is the negative ion for Ca2+
To determine the negative ion for Ca2+, we need to refer to the periodic table. The atomic number of calcium (Ca) is 20, which means it has 20 protons. Furthermore, it has a 2+ charge, indicated by the superscript +2 in Ca2+.
To find the negative ion, we need to consider the interactions between different elements and their charges. In this case, since calcium has a 2+ charge, it has lost two electrons to achieve a stable configuration. To determine the negative ion, we need to identify an element that would gain two electrons to balance this charge.
Looking at the periodic table, we find that oxygen (O) has an atomic number of 8. Oxygen tends to gain two electrons to reach a stable configuration of eight valence electrons, becoming an oxide ion (O2-). Therefore, the negative ion for Ca2+ is the oxide ion (O2-).